can be a greeting, an expression of bewilderment, an expression of over excited agreement, or nickname for a friend.
YAGOO! Wats poppin?

friend: you do the hw for today?
me: yagoo? we had hw!?!?

girl: yea sure you can have my numba
me: YAGOOO!

me: hey yagoo, how was your weekend?
girl: haha it was aight how was yours?
by rayrayalldayday February 04, 2010

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