"Peak" most often means "outstanding" or “highest” or “strongest” or “level of skill” or "the best." However in stupid children of the 00s slang for some bizarre reason, it can also mean something really bad.
Holiday Prices reach a peak during August.

Beat the egg whites until they are stiff enough to form firm peaks.

We saw a victory by an athlete at the very peak of her fitness and career.

Or 00s idiot child slang:
00s boy 1: I got my girl pregnant
00s boy 2: that PEAK bro, she such a bitch
by Definitionsaurus January 28, 2019
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Being at the peak of a high from cannabis or other drugs.
"Dude are you stoned yet?"

"Ya dude I'm fuckin peaked"
by massworder February 12, 2012
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When banter is of a whole new level that only certain words can explain it. Jokes may be said to be 'peak' when they are borderline taboo but still cause serious laughter. Any other words that have a similar meaning to peak suck as tip, summit, apogee and brink may also be used to avoid repetition.
Jimmy: Wow that joke is pretty harsh!
Tom: Hahaha!
Jimmy: Yeah who am i kidding? That was peak! WAL!
by Peak_in_Banter July 5, 2011
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Another word for the word muggage or boid.
When something is peak, its a cuss that makes your opponent upset and can't bring comebacks. So basically you have won.
Paris: Oh my gosh!! Why are you so ugly? Your so ugly that they had to invent another word for your ugliness.

Justin: Well, your teeth are so yellow that when its pitch black and you smile people think its morning so they get up. Your teeth is even brighter than the sun.

Simon: That was really peak. That was so peak that she has shut up.
by L(DORT)HypahStah March 17, 2009
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the result of ingesting copious amounts of MDMA.Deffinately the more social of drugs , MDMA can make the most shy annoying people seem interesting.. ofcourse only to other people peaking.Effects include a sensation of "floating" , as though you weigh nothing and your legs seem to glide rather than stride.Thus being able to dance hours on end.Everyone talks to you and you talk to anyone about anything and somehow it all seems to be the most indepth conversation about cornflakes you have ever had and it is sure to change the rest of your life
Man THOSE YELLOW DOVES ARE FUCKING AWESOME IM PEAKING OFF MY HEAD MAN WHOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO LETS DANCE *DOOF DOOF DOOF DOOF DOOF DOOF DOOF*
by AIDAN March 5, 2005
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looking pale as a result of sickness..
hey brother you're looking peaked. are you ok?
by Gary Morris November 22, 2006
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Definition One

When something beyond comprehension has happened to you or some one else you know, positive or negative you say the word peak to portray the sheer level of OMG

Definition Two

Peak times are times where life has thrown some crazy stuff at you and everything is just WOAAAAAAAH.

Usually a hand sign is involved which symbolises a mountain peak. If something is that deep the word doesn't even have to be said, you can just do the hand sign

Definition Three
When someone has been embarrassed so much so you feel the need to acknowledge the extent to which they have been wrecked
Guy: My test is tomorrow and I haven't done any work at all!
Friend: Peak times for you

Girl: Did you hear Jessy is pregnant!!!
Friend: PEAK

In Assembly
HeadTeacher: Why are you wearing that belt, its against school regulations, do you think it looks SEXY- because it doesn't
Class: OOOOOOOooo *giggles*
A few members of class: Peak
by Tazzzz February 26, 2014
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