A phrase often repeated a significant amount of times to the point where it becomes an annoyance and no one really values their company or even their existence. The phrase relates to a certain situation, however leads to nothing, almost a cliffhanger to what is implied when your on a horse.
Luke: When you're on a horse

*proceeds to shit uncontrollably"
by Gore finger February 3, 2022
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say this to your friends or in a conversation if you have nothing to say
friend: *walking with you and saying nothing*

me: "when you're gay"
by umm_ello November 7, 2019
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The only time (besides when you're drunk)where everything you hear/say is fucking hilarious (to you).
High Guy: Dude, this bag of Cheetos is going to fuck a your mom

Dude: That's only funny when you're high...
by Entr' Acte November 19, 2009
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Although a freindly parting salutation, this has it's roots planted firmly from the 70's pop culture of under-aged, underground consumption of marijuana and alchohol. This basically means: I have been talking for the last 5 minutes, and now realize that you are not only high, but not capable of understanding simple conversation, which, at this point, we can have at a later time, when you are not in such a state.
Hey bill, did you see that Kiss tickets go on sale on the 5th"Later When You're Straighter", dude!
by Uncle Duke October 22, 2009
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1. An incredibly annoying way of stating that you just don't want to tell them something; might be for personal reasons. (Knowing that you cannot get younger; it therefore means one will never tell them what you are referring to.)
Caitlynn: Why won't you look at my face when we make love!?

Me: *turns away and thinks to self "ah crap, here we go again... c'mon, think of something!* ...I'll tell you when you're younger...
by The OPB: Original Purple Belt October 11, 2010
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A phrase used when something can't be explained to a child
7-year-old: *catches adolescent brother watching porn* What is this?
Brother: I'll tell you when you're older.
by frabrizio March 24, 2017
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You're just too cool to bother with any details of anything.
And surpass the level of 'Epic coolness'

This line CANNOT be said. Unless you strike a cool pose right after.
Mother: Sweetie, you have weird rocker friends.
Daughter: I'm not a rocker!
Mother: ...Sorry. You have weird goth friends.
Daughter: I'm not goth!
Mother: Then what are you?!
Daughter: Mom! When you're this cool, You don't bother with the details. ;D
by Ashley ;D June 18, 2008
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