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"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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