Top Definition
To hit someone or something with your penis.
"What sound does a tankslap make? DONG!"

"Man, if she does that to me one more time, I'm gonna tankslap that whore."
av Stovaa 7 december 2007
The fine art of slapping one's "semi" off one's stomach to impress one's annoyed girlfriend. Also works with gay boys, apparently
I tankslapped and she was not impressed. Pah.
av The real Jeffers 4 augusti 2006

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