In this porn video tag, "thug" refers to a character or performer who is typically portrayed as tough, aggressive, and possibly street-smart. "Fucks" is a term that describes the act of sexual intercourse between two individuals. The term "tranny" can be considered outdated and potentially offensive; however, in this context, it means "transgender," referring to one or both performers being transsexual or engaging in gender roleplay.
So the tag is describing a porn video where a tough/aggressive character engages in sexual intercourse with a transgender individual or engages in a scene that involves gender roleplay.