useless as an ashtray on a crotch rocket Share definition Flag Completely useless Knowing how to fold socks in 10 different ways is as useless as an ashtray on a crotch rocket. useless as an ashtray on a crotch rocket by Blake November 12, 2002 0 0 Get merch Get the useless as an ashtray on a crotch rocket mug. Buy Now — $32.95 See more merch