The sound made when you receive head. This term is used by men to talk with their friends about hookups so the girls wont understand.
Alex: So what did you end up doing last night?
Bob: She was like thwonk yo.
by Chase Redden January 6, 2008
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A twink but extra soft and fluffy; chubby.
Darren: Oh my god, did you see that boy that just walked past?
Kevin: Absolutely adorable!
Darren: He's not a twink though...
Kevin: He's a thwonk, and that's better.
by crumpeteer01 October 30, 2022
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