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Seeing a girl/woman/milf/gilf basically a fitty worthy of a mention and alerting your colleagues/friends in the local area that a she is approaching by knocking 3 times "3taps" on your desk/wall/table.

Simple yet effective

oh shit she is "3taps" !!!
Fit girl walks past/approaching....

"3taps"

knock your desk 3 times so your pal looks up acknowledges and in turn knocks the desk 3 times
by The_Wingnut June 08, 2011
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