E.Fed's definitions

gnak gnak

v.
An expression you use when you are high (or on some occasions it has been done sober when a person gains a burst of energy and does not what to do with it). Usually it resembles an imitation of a raptor while saying the proverbial "gnack gnack". It can be spelt either gnack gnack or gnak gnak.

At the party, Buttons put his hands up like claws, looked around the room, and said "gnak gnak".

by E.Fed February 2, 2007