Lil Wayne is fairly impressed or angered by Kevin Durant's dunk

Lil Wayne is a huge fan of all 30 teams in the NBA, depending on who is winning at the current moment. Today, he's either a fan of the Thunder or the Heat. I'm not sure which. It depends on the quarter.

I honestly forgot that Lil Wayne was relevant before this awesome GIF. What's he doing? Who's he yelling at? Is he a fan of the dunk? I thought he was a Heat fan. I'm so confused.