Someone who rims butt holes (licks them) and is is always menatlly challenged (retarded). Thus Rimtard is a collectuve of the two.
by Butt monkey September 9, 2004
Get the Rimtardmug. by Harvey-Lipshitz December 26, 2011
Get the RIMtardsmug. by Thebrownielover January 24, 2020
Get the Rimtardmug.