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2.
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.
by The real Jeffers August 04, 2006
 
1.
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."
by Stovaa December 07, 2007