Greasehead

Funny thing—as we're warming up oncourt, an Italian-looking greasehead slides out of the stands and approaches Leo.

Source: wiktionary

"I want twenty!" Sergeant Sweet Talk told me. / A guy behind me muttered, “Jesus!” like he felt for me, and the drill sergeant got on his case next. He said you're going to beat your face, too, greasehead, because the guy behind me was Spanish

Source: wiktionary

"You think Souza made the threats?" / “The grease-head cowboy? Maybe. He's been causing trouble, sounding off at anyone who looks slightly foreign, telling them to get out of town. / […] "Souza's that mafioso cowboy I told you about"

Source: wiktionary