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1.
Sound made from unzipping the pants and a large member hitting the floor. Normally used when someone makes you mad and you want to get them back or do something bad to them.
I am gonna get you back. Zip thunk.
by Bob May 17, 2003
 
2.
Comment made to infer homosexual activity on the part of another, usually made in the middle of speech by the other or during a movie or television show
by Anonymous May 20, 2003