Wanna make sumpin’ of it?
(you) wanna make something of it?
A threat to fight or argue about something, usually something that should be minor or easy to overlook. ("Wanna" is a colloquial contraction of "want to." "Something" is often shortened to "somethin'," or, more colloquially, "sumpin'.") A: "Yeah? You wanna make something of it?" B: "No, I'm sorry, I simply wasn't thinking when I said that about your marriage. That's all." A: "I heard yer daddy got fired fer drinkin' on the job again." B: "That's right. Wanna make sumpin' of it? Cuz I'd be more'n happy to wipe that smug grin off yer face!"