When a man penetrates any orifice of another persons body with his penis.
This term is a product of the popular line from the LOTR series. EX. "You will taste manflesh!" Or; "I smell manflesh."
Use the line in a single word verb fashion. EX, Manfleshed or manfleshing or simply manflesh.
"Dude, I manfleshed that chick over there.