A RUB is a random unexpected boner. Kinda explains itself. Its comes and goes and is definitely not needed.
by Bob man meyers March 07, 2017
"I'm not sure what is worse a middle aged R.U.B. on a Harley or a 19 year old SQUID riding a GSX-R1000!"
by Steve Johnsenson January 15, 2005
by Kujo1200 July 08, 2007