LNSM Share definition Flag Late night sex machine(LNSM) is somewhat of a booty call with a man who is great at sex or can last for hours like a machine. Sorry I can't work tonight I have an appointment with my LNSM LNSM by Appletown July 20, 2018 0 0 Get merch Get the LNSM mug. Buy Now — $32.95 See more merch