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5.
very very erect nipples, usually on a female
check out the peaks on that chick, she must be freezing

she's so horny that you can see her peaks through her shirt
by Jumbalya November 14, 2007
 
1.
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
 
2.
Term of increasing popularity amongst the urban youth of Londinium, it often comes accompanied with hand gestures replicating the peak of a mountain.

It can refer to an excellent or top quality situation/object/event/person. (1)

Curiously, it can also refer to a very negative situation. (2)
1) Oh man that rave was ^peeeeaak^!!!

2) Dude, your girl is giving you bare shit nowadays, that's peak.
by Inaamace01 February 18, 2011
 
3.
Peak; Bad luck, gutted. When some shit goes down that is bad on your behalf, peak for you. When something bad happens to a mate , peak for them. Effectively meaning bad luck / gutted to fuck. English street slang.
Wasteman: "Shit, My phone battery just died!"

Badman: "Peak for you son"

Alternatively-

Homeboy #1 "You got a roach ?"

Homeboy #2 "Na fam , fresh out cuz"

Homeboy #1 "Peak , needed that shit!"
by BASHYSBTV March 07, 2012
 
4.
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 04, 2011
 
6.
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
 
7.
If youre at your peak, it means for a while your life will be the best.Thats fine, but when it's over, youll miss the 'glory days' because your life will NEVER be as good as it was.Popular kids with everything? Their life won’t get any better.Once they hit 30, life starts going downhill, and youll be laughing with your spouse, kids and job.If you're still in school and you want to be like them, think about this: If they live up to about 90, their peak is roughly a ninth of their lives, when they are young and learning, maturing.If you havent peaked yet, consider yourself lucky because each day is a step closer.If you peak late you could become one of those oldies that you see on the news that achieved something great with their lives.Having a normal childhood is the best because it prepares you for life and develops your character.The people who peak while theyre young are worst, because they don't actually have a personality.Its true.And if you don't develop a personality early in life, it can lead to problems for the rest of it.If you feel you are in your peak currently, don't fret; all you have to do is stop peaking.Do what makes YOU happy.Go back to a state where everything makes you excited.Forget about social status and live your life but be sensible.Save it for when you give up.If youve already peaked, remember all the happy times, sounds and emotions from your peak, and don't just give up. Think of the way you live your life as a rehab.No peak lasts forever.
by caretake August 26, 2012