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 27, 2007
Loving it up at a club, usually while on E's. Although can be seen to be done by some retard townies at crappy, cheesy night clubs.

Someone who peaks often can become known as a peaker.
"Was you peaking last night"

"Look at that knob head peaking"

"That clubs shit, its full of peakers"
by Marma D August 29, 2003
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