the sound when something hits your window but it doesn't break it
some idiot was throwing rocks at my window, I heard loads of thonks.
by FlappyBird73 November 4, 2020
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*Thinking intensifies*

T H O N K I N G
John: Yo, yesterday Jon started THONKING so fucking much his brain almost went into maximum THONKING overdrive .
Joanne: I know. It was INSANE.

Jon: r ya fagz tolkin abut me?
by EcxsVoc June 14, 2017
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When you think you've a good idea but turns out to be stupid
Friend A: Oh i got it, it's big brain time.
Friend B ( but not A's BFF, just kinda there) : What is it?
Friend A :Never mind it was a thonk.
by BigThonk March 21, 2020
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Something that is exceptionally thicc.
Fred: oh hey Bob did you see Riley today.
Bob: Yeah bro, he looking Thonk.
by Omahergix March 11, 2021
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Look at that thonk he soo thicc and good
by Thonky boy July 1, 2019
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