Tyga is dating Skater Girl Avril Lavigne, who broke up her engagement with rapper Mod Sun to be with T-Raww.

That's rubbed Gym Class Heroes frontman Travie McCoy the wrong way.

McCoy, who was once so tight with Tyga that he called him his cousin, went off on the former Young Money artist during a recent show he did with Mod Sun.

 “I wanna give all the love in the world right now to my brother Mod Sun,” he said pointing at Mod. “He is one of the three most loyal muthafuckas I’ve ever met in my fucking life. It goes Mod, it goes Airo and it goes Gata. Fuck Tyga!”

Then the crowd began chanting f*ck Tyga, much to the delight of Mod.