Top Definition
when a cool kid goes out on the town with the intention of blowing his beak off with vast quantities of class A's up his noz. turning his purple head more radiant than it already is.

biswac is an alternative term for bonkers,trollied,battered etc. and is ysually kept for people with high pressure jobs in the competitve money transfer industry..
I was in the globe last night with rends and got fucking biswacked
by ian cragg November 10, 2010

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