T-RexUSA is a fanboy on Topix Dinosaur Forum. He arrived in late 2012, and began to spam the forum. He often trolled threads with fellow spammer Rexby, until he left. However, T-RexUSA had continued to post infrequently, during the Australia Forum Crisis and into 2014. He still visits the forum sometimes, although he is generally given no attention by more mature users, such as Paleoworld-101 and Paleoguy, for example.