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Definitions by TheChosenOne83

SBSI 

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Acronym: Side-By-Side Insertion

A dude and his bro banging chicks next to each other.
Bro #1: Dude, wanna get some honeys and SBSI tonight?

Bro #2: Hell yeah, double the titties!
SBSI by TheChosenOne83 October 19, 2011
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