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When the person on the performing end of fellatio quickly and thoroughly spits out the other's love juice, resembling a sprinkler system. This is usually in response to a "surprise" attack, but not always.
Don't even think about asking Shaniqua for a blowjob, she'll go all rainbird on you. Instead, dangle that cock-sicle in Kimberly's face. She'll lap it all up.
by z0ner June 08, 2007
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To cum so forcefully that you go off like a lawn sprinkler
I caught Scott on a porn site last night, he was going rainbird on his desk!!
by Mr. Noyb April 18, 2006
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