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Silver Back'ed named after the Silverback gorilla, is a sexual act of having anal sex then ejaculate on your partners back then messaging the semen on the entire back while rapidly thrusting your penis balls deep in both the Vagina and the anus switching between each.
Jerry: Max, man I totally Silver Back'ed Jennie last night!

Max: Dude that fucking kick ass!

Jerry: Hell yeah, am about to did it again tonight with her sister!
by Steam Snake June 27, 2010
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