to thwackit is to jackoff, spank the monkey, flonk the dolphin, rope the poney, wrestle with the snake, choke the chicken etc. etc.
jimmy thwacked it all night until his shlong turned chrimsen.
by da cheese June 17, 2003
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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.
by Hayers111 February 26, 2007
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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?
by Nicka-Licka-Dicka March 4, 2005
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A derogatory word, implying someone intentionally masturbating someone else. The word derives from the sound of a penis being slapped.
"Thawck!" - stated by Mr Ben upon seeing his sister go to her room with her boyfriend.
by Mr Ben February 8, 2005
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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 September 4, 2003
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I was rolling up my leather belt and it was thwacking on my pussy
by Supmo August 14, 2018
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The sound effect created in cinema and games when skin is violently struck with a blunt force object.

Notably found in the show Daredevil and the game Rust.
There was a beautiful, meaty thwack when I used my rock to tear the chicken breasts from the body of that hog.

Daredevil took down the muggers with a flurry of meaty thwacks, leaving them senseless on the ground.
by WillemNotAlistair April 11, 2016
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