Top Definition
To get an assassination medal in halo 3 by meleeing in the back. Commonly used by tsquared captain of the halo 3 team Str8 Rippin
Tsquared: Give em' the back smack baby!
po BoweTheShow Јун 22, 2009

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action verb: To strike another person because they have just pissed you off. One can backsmack by thought, word, or deed.
Steve: "Did she just cut you off?"
John: "Yeah, I 'd like to backsmack her!"
po Lexie 1912 Септембар 19, 2008

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To violently slap someone on the back.
"Dude, it hurts so bad!"

"Take that back smack bitch!"

"Did you see Todd totally get fucked up, that was the worst back smack I have ever seen!"
po Tango09 Март 31, 2010

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To talk about someone behind their back
Brittany:"wow she looks really ugly"
Jessica:"sorry I don't backsmack"
po Backsmack Септембар 12, 2014

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