This phrase is often used by people who identify with the "
hipster" or "
indie" crowd. The phrase literally means "ya
dude" and sounds like its meaning if said fast enough. But of course such hipsters have to put a unique spin on an average phrase which causes people to turn and go "huh?" when they hear it.
Regular person: "Hey, have you
heard of the band Animal Collective? They're awesome!"
Hipster person: "Chya
doo. I heard of them ages ago."