Ex-Math

The logical study and application of basic mathematical principles to deduce when your significant other was last with their ex-boyfriend or girlfriend.

While founded in the scientific theory, ex-math should not be considered for a major field of study as the process is often characterized by the absence of objective and rational thought.
Girlfriend: "I wondered after I left about the age you said you were when you were with XX so I put everything in a calendar. You said you were 24 so that was a couple of months before me? :-) sorry. I try not to be curious about stuff as that is typically not a good thing. But I wondered it and so I'm just...um..saying that I was curious."

Boyfriend: "Well if you're going to use ex-math, put it on a Chinese calendar. That way I haven't been with her since last year. Does that make you feel better?"
by Drexlzorg November 09, 2011
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Capital Ex

That one ex you always think of first when someone says "your Ex". No matter how many ex-girlfriends or boyfriends you have, there is always going to be one who stands out in your memory, one who you always think about unbidden. Normally this is the ex who had the most serious relationship with you. The phrase "capital Ex" is used to differentiate.

The "E" is capitalized.
Rob: "Hey man, I ran into your ex today. Turns out she's lesbian now."
Jon: "Shelly?"
Rob: "No man, Jenny. Why do you always think I mean Shelly?"
Jon: "I don't know. I guess she's just my capital Ex."

No matter how many exes you have, there's always that one Ex.
by PimpinZ April 29, 2013
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Ex sex

Is when your dick feels homesick and nostalgic.
Jokes aside, it's one of the easiest kinds of sex to get.
It may ruin your life an get you on the verge of "please come back to me" bullshit. However, it may also make you "whole" and keep you from idealizing the girl (and reflecting over the relationship you used to have)
I tell our mutual friend "say hi from me when you meet her".
5 days later some crazy ex sex happens. It literally takes you next to nothing to grab some ex pussy action.

I gave Jackie a call and we had some ex sex. Why? He knows my body well, those one night standers don't really come close.
by DJ Blowback January 23, 2019
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ex-batallion

A group of jejemons in the philippines doing rap music and all the useless thing you could ever imagine.
q: Are you an Ex-batallion?
a: putang ina mo ba?
by 123alsdhkjdf January 16, 2018
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ex bond

The feeling that the people you roll with (ecstasy, ex, MDMA) are your closest friends; bonded through ex
After rolling, Sally and I have the craziest ex bond. I feel like she's one of my closest friends now.
by mayg August 18, 2011
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Shinras ex

Shinras ex is usually a term for a very quirky e-girl that plays a lot of VRChat.
Although he doesn't know who's behind the VR headset, he usually starts dating these people based on their pixels alone.
Lets go to a public Black Cat to pick up Shinras ex.
by Sky7734 October 04, 2022
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Ex day

Today you must talk or sit with your ex boyfriend, girlfriend, husband, wife, or best friend.
Boy: can I sit here
Girl: why, we are ex’s anyway
Boy: it’s “Ex Day
Girl: oh go ahead
by Alyssa Beaiky November 08, 2019
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