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1.
70's black slang for a large penis.
Don't slip that girl your sweetback, she's got the clap!
by Dave December 13, 2005
 
2.
sweetback refers to a dude who is too smooth and fresh to go by any other, less respectful, term.
Shit, sweetback, you be smoove with the bitches!
by Marco St. John June 22, 2004