Sometimes, there are .GIFs of fans that neither need nor deserve an explanation. For this particular Dallas Mavericks fan, who you'll notice is wearing sunglasses indoors and whose cowboy hat doesn't have a top section, whatever spurred this outburst is nowhere near as entertaining as the outburst itself.
He could be giving the Georgia Bulldogs cheer or, based on the way he's holding his free T-shirt, hacking up a lung. Either way, continue doing what you're doing, sir. We tip our topless cowboy hats to you.
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