TMZ's obtained police body cam footage from the rapper's December arrest before his flight outta Miami. You can see an incredibly frustrated Pump repeatedly tell cops a bag that smelled of weed, according to TSA, was definitely NOT his.

In the video, you can also see Pump's manager mount the same defense ... but clearly, it fell on deaf ears because cops were adamant the bag belonged to Pump. Check out the video ... Pump gets visibly angry and that triggers a cop to shout right back at him.

TMZ broke the story ... the rapper was hauled off his flight from Miami to L.A. after he was accused of carrying drugs in the bag that smelled like weed. Our law enforcement sources eventually confirmed Pump's version of events -- he was NOT carrying any drugs.

Pump's manager was also arrested for disorderly conduct. Both men entered not guilty pleas.