To go up to a girl and tap her boob from underneath then run away in laughter.
"Hey homie! Go tit tap that chick!"
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When a girl is climbing on top and her tit taps your member
When Alice was climbing on last night she totally tit tapped me.
by cdqq4819 July 24, 2018
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As there is a slap ass Friday, there is now a tap tit Monday all you do is tap their tit (if they are a girl)
“Hey Sarah!” *taps tit*

“Ow what was that for?!”
“It’s tap tit Monday!”
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