Definition: I concur.
History: Originally used by pirates.
Parrot: Pieces of eight! Pieces of eight!
Captain Bart: Shut up, birdy!
Parrot: Polly wants a cracker!
Scurvy Sam: We're running low on vittles, Cap'n sir. I say we cook the parrot.
Captain Bart: Arrr, matey!
Parrot: Walk the plank, ye filth!