Top definition
the act of sneaking up behind a female and hitting them in the vagina. Works best while walking up the stairs behind them. You can use a closed fist or an open palm.
Guy: *walking up stairs behind girl, hits her in the vag*

Girl: Ow! What was that for?!

Guy: Nothing... I just wanted to Ninja Twat you.
by ilovebirchbeer_not April 27, 2009
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