old mans swimsuit Share definition Flag a condom or johnny...your old man penis and his rubber swimsuit is the condom "oooh better get my old mans swimsuit on" "oh no i havent got a swimsuit for my old man" old mans swimsuit by Mattyismint June 10, 2005 0 0 Get merch Get the old mans swimsuit mug. Buy Now — $32.95 See more merch