When you meet a girl at the bar and sleep with her and then decide it would be bad of you to not see her again. You then proceed to date her for 3 months.
Q: Wow is that your girlfriend?
A: WHAT?!?! No! I picked her up from the bar three months ago...its just a three month stand.
by threemonthstand September 26, 2011
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Also Three Month Rule, or relationship, or milestone, or point (you get it).

Describes the time past in a relationship (3 months) in which couples consider if they want such to be long-term, which is to either make their love more serious and official, or decide to reevaluate it all together and even end it. Generally, the first three months of an relationship are the most exiting, and define the first stage of one. 3 months gives each person the time to 'get to know each other' and to measure the other's character and its consistence past the illusions of expectations and ideals.

3 months is purely arbitrary, but is a 'thing' to allow lovers to have a milestone in which they reflect on how things are going, and can be used as an excuse by one to set things further into motion or to end it all together.

In short, love and relationships has no obvious rules, but that makes it difficult, so coming up with some general truths in the midst of it all helps .
Bro 1: Dude.. Everything was going perfect until she brought up this three month mark rule shit, the hell does that even mean?

Friend: Here, look at this definition I just found.
by Dieg-J January 6, 2022
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Noun (only plural)

1. Overtly expensive 'designer' sunglasses (Dior, Klein et al), named as so because they are to be worn only for three months, after that they are out of fashion.
2. Any overtly expensive fashion product expected to run out of fashion in limited time.
3. Any piece of art bought only because of the name associated with it and not the piece of art itself.
4. Sunglasses associated with three months.
1. 'Yes, I'm serious, he bought Dior glasses for three-hundred EUR and after three months just didn't wear them any more because it was out of fashion.'
2. Yes, I'm serious, he bought Dior anal lube for three-hundred EUR and after three months just didn't use it any more because it was out of fashion.'
3. 'This Mondriaan here is the prize item of my collection, I'm extremely positive I would have bought for enough money to sustain a third world country for six months any-how if the artist wasn't famous. If you do not see this, you know nothing of art.'
4. I hate it when there are three-months sunglasses in my prawns on the barbie.
by Lajla July 11, 2008
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The unwritten law in World Wrestling Entertainment (a.k.a.) that states that any storyline that happened more than three months ago never actually happened. The term was coined because Vince McMahon (WWE owner) enjoys insulting the intelligence of his fans by - for example - teaming two wrestlers who as recently as several weeks ago were attempting to kill one another in the context of the storyline.
Guy #1: Last November at the Survivor Series, Steve Austin tried to kill Triple H by having a machine lift the car he was in and drop it to the ground...and a year before that, Triple H had Austin run down by a car...and now they're teaming with each other? What's up with that?

Guy #2: It's the three month rule, dude. It never happened.

Guy #1: Oh yeah. Why does Vince insult our intelligence like this? We're not stupid.

Guy #2: I don't know, dude...I don't know.
by jasonisjericho May 28, 2006
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the mix between a 1 night stand and a relationship
Person A : Gonna bag me a trophy gf I say gf cuz I refuse to end up like tiger and Wana take the jeter route, instead of memorabilia in the car service ill leave plan b and the number to a psychologist, and to the really lucky ones id like Time to b driving the limo in the morning, roll down the divider and give the chick a life lesson and make her rethink her state of being

Logical Person B : Haha so how is this a gf again?

The Voice of reason : seems more like a 3 month stand without the worry of having to give her ride home
and Person A values pillow talk.. you have pillow talk with a gf, not with a 1 night stand
but thats why three month stands are appealing, you get what you want from the physical part and the emotional part, without actual commitment
by voice of reason using logic December 21, 2011
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When it is time to move on and get a new significant other because the euphoria of a new relationship has passed..Otherwise known as dump that bitch ..
DUDE! its time to give her the three month bump !!!
by flying_finn March 16, 2008
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The unwritten but universally accepted amount of time before a close friend of a friend may get together with said person's ex girlfriend. It may be wise to consult close friend for approval before delving into said ex-girlfriend.
A: Hey, lets break up.

B: Okay.

*Insert Three Month Rule*

C: Hey, I'm B's friend. Wanna bang?

A: Sure.
by Michael Habic June 11, 2008
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