Kanye West finally fires back at Ray J

Kanye West decided it’s finally time to destroy Ray J — and last night he blasted his wife’s tape partner on national TV … going straight after Ray’s manhood.

West made a surprise appearance on “Late Night with Jimmy Fallon” to perform his hit “Bound 2″ — but during the song, he changed some of the lyrics to attack Ray:

“Brandy’s little sister lame man he know it now … When a real brother hold you down, you ‘sposed to drown.”

We’re guessing Kanye is finally responding to Ray’s song, “I Hit It First” … in which Ray bragged about bangin’ Kim Kardashian before Kanye did.

But the best part of Kanye’s attack … the legendary Charlie Wilson punctuating the venomous lyrics with a “shabadabaweeeeeee”It’s awesome