(TMZ) -- Desiigner got caught with his pants down while making a surprise pit stop in a residential neighborhood ... and TMZ has the video!

The rapper was spotted in WeHo Tuesday taking a leak on someone's garage door. After relieving himself, he hustled across the street and hopped back into his hot whip.

TMZ was told right before Desiigner's public pee break ... he snapped a few pics with fans on the street and loaded some Fresh Corn Grill to-go bags into the car.

Hopefully he washed his hands before he chowed down.

Photo: AOL