Drake's Middle Finger Pissed Off Chris Brown !

According to multiple witnesses in the night club, Drake flashed his middle finger, engaged in serious dirty talk, and drafted several other rappers to join him minutes before the nasty brawl with Chris Brown.

According to reports, the tension started heating when Drake gave the middle finger to one of Chris' bodyguards and shouted:  "I'm about to go whoop that ass!" Chris' entourage then returned fire with a few hand gestures of their own.

Witnesses, who were very close to the action, revealed that Drake felt disrespected even though he started the exchange  and went to get backup from his boys Meek Mill, Juelz Santana, and Trav B.

At this point, Drake reportedly got loud and shouted at Chris  "You be on that ho s**t on Twitter n***a" -- a clear reference to a recent Twitter war between Chris, Drake, and Meek ... all over who's banging Rihanna.

Moments later Chris' security guards got furious, pushing and shoving began between Meek, Juelz and Chris' posse and the rest is history.

Interestingly, everyone agrees Drake never got physically involved in the brawl even though his mouth and finger sparked it all. 

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