Definitions by Dr.Klyp

Smash Bros 

When two brothers related by blood have sex with the same girl.

Bro 1: "Hey, did you fuck my ex Emily?"
Bro 2: "Yea, what about it?"
Bro 1: "That means we're Smash Bros now."

Smash Bros by Dr.Klyp January 5, 2020