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.
A person that watches or gambles on a game of pool without actually playing
You should see the side money games at pool expo - I saw a race to 21 racks of 10-ball for $5,000. Must've been 50 railbirds around that table getting in on the action.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).