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1.
The origins of this phrase are somewhat hazy.
Here at the University of Colopetary we have made some progress as to dates and possible meanings of the word. We have so far discovered that it would seem to be the sound which fish make while in OR out of water. The exact dates are not exact but we do know that the "sound" originates sometime in mid-2007.
"POOK POOK" Said the fish.
by Stephen Ramsay May 18, 2007
 
2.
Filipino word for hooker/whore/prostitute.
Hey Marcus, do you want to go find a pook pook tonight?
by DangerousLiasonBitch April 04, 2009