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
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
Amazing band from Melbourne, Australia.
"Man, I saw Rainbird at the Espy last night! They were iNsAnE!"
by BreathingCompass February 05, 2010