Pro piping is what the UNIT clan of CoD calls it when useing the grenade launcher. Also refurred to by the elite few of UNIT clan as Laying Pipe
Keegan121610: Hey SarKIS11, guess what I'm going to do this game?
Keegan121610: I'm going to go pro piping on all these Noobs!
SarKIS11: Yes!! Lay Pipe big boy!!!!