Top Definition
A Cosmic Silverback is when you are having sex with a girl and you blow your load on the small of her back while eating a Cosmic brownie
Tom: "I heard that chick was a super freak"

Rick : "I know she made me give her the Ye Ol Cosmic Silverback last night, it was weird but tasted great"
by Kipper The Dog August 25, 2012

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