Waka Flocka Flame Pot Bust

Law enforcement sources tell us ... Waka was pulled over for a routine traffic violation a few hours ago ... but when cops approached the rapper's White Chevy Tahoe, they could smell the odor of weed.

We're told Waka was asked to step out of the vehicle -- and was placed in handcuffs. When cops searched the ride, officers say they found "a small amount of marijuana" on the floor.

Waka was cited for possession of less than 1 ounce of weed AND failure to wear a seat belt. He was eventually released and sent on his way. We're told Waka was "very cooperative" during the incident.

Flame is no stranger to the law -- earlier this month, he was arrested for drug possession in NY when cops say he brought weed to a mall. Back in 2006, he pled guilty to possessing a sawed-off shotgun.