Because absolutely everyone and everything in Star Wars has a name revealed in supplemental materials, we know this dude is named Wuher. You might remember him as the guy who looked like a cab driver who might ask if you want to buy a Romanian teen. He's a cranky anti-robot dirtbag mopping up severed arms in the armpit of Tatooine, but in this story, we learn that he has dreams of more. Specifically, he wants to create a drink so delicious, so exquisite, that it would make him famous across the Galaxy. Along the way he rescues a droid named C2-R4 from a group of abusive Jawas, and the unlikely pair form a friendship while grinding up corpses.
You see, when Greedo walks into the Cantina, Wuher catches a whiff of him. And Wuher likes what he smells. Greedo apparently secretes delicious, sexy Rodian pheromones, which Wuher can detect with his "big nose" and its "highly trained and sensitive olfactory capabilities." Then Han guns Greedo down and leaves the sweet-smelling, slightly roasted corpse in the middle of Wuher's bar. Lucky!