action verb: To strike another person because they have just pissed you off. One can backsmack by thought, word, or deed.
by Lexie 1912 November 1, 2008
 Get the backsmackmug.
Get the backsmackmug. by yA HIGH BOY  November 18, 2017
 Get the backsmack crewmug.
Get the backsmack crewmug. by Backsmack September 12, 2014
 Get the Backsmackmug.
Get the Backsmackmug.