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When someone is such a bitch, the word "bitch" and the second-person word "you" become one word, with emphasis placed on the word "you".

Also works if someone does something or makes a bitchy decision.
John: Got any big dawg juice?
Lennon: Nope.

John: Yubitchyu.

Bob: What's up?
Dylan: Shut the hell up.

Bob: You bitch you.

Jimi: Hey girl, lookin' fine!
Dolly D: You have a small dick.

Jimi: Yubitchyu.
by It's Beer Pong, Hoe! September 23, 2012