To Swing your hand violently over your head in a circular motion. Can be executed with a fist or more effectively with a hand placed in the "Number 1" setting. Frequently done instead of dancing to assert dominance at a bar or club. Usually people shum during sexual intercourse, or when they are heavily intoxicated. See: hossed or haused.
We ripped like 5 shots and about 5 minutes later I was on the dance floor shummin'
by GVR February 23, 2013