Top definition
Finding a person who you think may have been physically attractive in the past, and you would " tap that " if you had a time machine. (By going back to the past when he/she was attractive).
Iain: "Yo man! My French teacher Ms. Murray is so hot!"

Adam: "But she's like, 50 years old! What a turn off..."

Iain: "I'd totally Tap That Time Machine."

Adam: "Agreed."
by MackPC November 03, 2009
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