to hit hard and percise. Usualy producing a THWACK sound.
With a "THWACK" the bamboo rod hit table.
by Myoga1 February 24, 2004
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to be speed up as much as possible off of speed/meth
lets get all thwacked out, go to the titty bar and rub tuna on ourselfs then go home to our women...
by Dann¥ May 19, 2007
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To receive a hand job or blow job, and to not finish.
"Dude, she was thwacking me for an hour yesterday."
"How did you not finish bro?
by Dan GleeSack December 06, 2012
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To firmly slap ones penis across another persons face i.e. to be either very manly or very homosexual.
"Dude! That little limp wristed faggot just thwacked me!"

One jock buddy says to another...
"WHOA! Billy's asleep, someone thwack him!"
by Steven Spears April 14, 2005
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