A mix between Shawn Sanbrooke (from Theme Park Worldwide) and a Magnum ice cream.
Friend 1: "what do you want to eat?"
Friend 2: "how about a Shmagnum?"
Friend 1: "sounds good!"
by Sexygal123 May 21, 2020
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Yeast that accumulates underneath the foreskin of a man's uncircumcised penis when he isn't very hygenic.
Yo man, do you know Craig? His shmagnum smells fucking dirt.
by unibrowski December 30, 2016
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