Note: This is a VH1-provided bonus clip from Season 2. But still includes repetitive use of the phrase and fake acting!
Smashed a Homie: Cheat on your partner with his or her good friend. Variables include "smashed da homie" and "smashed a shortie."
I learned this new phrase last month when I accidentally watched the end of For the Love of Ray J on VH1. The show, which I don't reccomend to People, Old or Young, is a Bachelor-style show where the producers of VH1 vet possibly unstable women as ideal mates for Ray J, a 28-year-old man famous for being Brandy's little brother and starring in a sex tape with Kim Kardashian.
In this context, "smashed a homie" can be translated to "had sexual relations while in a relationship
Go forth and live with less confusion!
Urban Dictionary definition