Top Definition
To smack between someone's legs repeatedly very fast, moving quickly like a sperm tail.
I was walking up the steps when all of a sudden, someone sperm tailed me from behind and I almost fell over.
by killerqueen33 November 19, 2008
1 more definition
When some holds a roll of toilet paper out of a moving car and let it unravel as you move down the street looking like a sperm tail.
Guy 1: I just made some serious sperm tails with some friends.
Guy 2: how much TP did u use?
Guy 1: Alot
by Arex Wrong September 10, 2011

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×