Shirtlessness Share definition Flag 1.(noun): state of being shirtless (usually men); 2.(verb) the act of taking off your shirt. 1. The man was shirtlessness for 6 years 132 days 47 minutes and 21 seconds. 2. Robbie shirtnesslessed himself. Shirtlessness by Bob Reg Napar October 12, 2007 0 0 Get merch Get the Shirtlessness mug. Buy Now — $32.95 See more merch