TMZ has learned ... a gaggle of cops raided rapper Waka Flocka Flame's Georgia home this AM on suspicion of prostitution -- and Waka's mom tells us, fellow rapper Gucci Mane is in cuffs.
Law enforcement sources in Henry County tell TMZ, cops are investigating possible prostitution.
Waka's mom tells us, cops are also looking for evidence of gangs and drugs, though we have not been able to confirm this with law enforcement.
Our law enforcement sources say cops found marijuana and weapons.
According to neighbors, there are still four cop cars parked outside.
We're told Waka (left) is not there -- and his mom tells us, if he doesn't show up soon ... cops will issue an arrest warrant.
UPDATE: We're told Gucci Mane has since been let go. Waka is still AWOL.