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1. thwack
to hit hard and percise. Usualy producing a THWACK sound.
With a "THWACK" the bamboo rod hit table.
by Myoga1 Feb 24, 2004 add a video
2. Thwack
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?
3. thwack
to hit
Nikki thwacked her friend on the arm.
*thwacks you
by ^_^ Sep 28, 2003 add a video
4. thwack
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 Apr 14, 2005 add a video
5. thwack
The sound made by the scrotum striking the belly of a women whilst making love doggy-style
The thwack sound echoed through the room as I reached satiation.
6. thwack
A firm thumb that a hard penis gives to a female (or male... depending on your taste), in any number of places.
Puedes THWACK tu SCHLONG en mi cara, por favor?
Translation: Can you THWACK your SCHLONG in my face, please?
7. thwack
Being under the influence of methamphetemines, particularly Ice.
My homie Dropkick left his dope on the coffee table....and his coffe table out in the yard because he was thwacked
by Sidekick Jones Sep 3, 2003 add a video
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