When someone attempts and fails at performing a donkey punch, the reciever tightens their orifice in honor of the effort given by the donkey puncher.
Rob tried donkey punching me last night, but the dumbass hit my shoulder. I gave him a courtesy clench just to make the poor bastard feel better.
by JOKRGUY2012 October 12, 2010
Get the Courtesy Clench mug.