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When one puts their face in another person's buttocks and moves their face back and forth while making a motor boat sound with their mouth by blowing air and making their lips flap. similar to motorboating but for the rear end.
"Last night i took it to the next level with liz, i rooster tailed her and she went wild"
"take that shot and lets go out rooster tailin!"
by Dr. Frankenschmingle May 20, 2009
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