Top definition
To engage in sexual activity in the back of taxi.

The activity must consist of two humans of the female sex and one of the opposite and more superior sex, the male.
Dude #1: Hey dude, did you hear abut Brendan? He totally leithed two chicks last night!
Dude #2: No flipping way! He's the king of The leith
by Leithmeister August 08, 2009
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