to peak means to find an extreme amount of amusement in something, "peaking" usually results in extreme laughter and joking around. If something is a "peak" it will usually be referred to and remembered as a good memory for a good amount of time after the "peak" has occured. This particular definition of peak also originated from the batting cages of northgate baseball's varsity feild.
"I peak at that kids jokes"

"I was peakin so hard when I saw my brother get hit in the head with a frisbee"

"What a peak"
by staypeakin April 12, 2010
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To appear and act 65 even though you're only 21
eg. married, mortgage and job
Some chap 'Hey Peaks i like your slippers'
Peaks 'thanks young fella, my arse, etc, etc'
by Bob April 6, 2004
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To be angry, upset, frustrated, pissed off at anything, whether that be someone or something etc.
"I dropped my phone yesterday man and it broke"
"You would be peaking"

"His girlfriend dumped him just yesterday, he is peaking hard!!"
by Sniggdog November 28, 2007
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Another word for orgasm, cum, enhanced sexual experience, etc.
He really did make me peak last night.
by Bagitbabe August 23, 2008
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She looked up at me from her knees and I peaked.
by Diggity6 October 10, 2017
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Peaking is when you poop so much that the poop looks like a mountain. With the top peaking over the water making a peak.
I took such a big poop it was peaking.
by Peaking January 7, 2015
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