Yo, I gotta go TCB.

Jerry Seinfeld -
Really. So uh, what do you do down there all day?

Cosmo Kramer-
T.C.B.
You know, takin' care o' business.

"Now I'm T. C. B., mm-hm," the King said, looking into the mirror as he zipped up his brand new, white leather jump suit. "Mm-hm, taking care of business," he said, as he ran his fingertips along the multicolored sequins arranged like a firebird down the chest of the suit.

Judge Joe Brown: "You need to get out of my court. Coming in here actin' a fool.

Crackhead Girl: "Actin' a fool!? I ain't no fool! I got a GED."

Judge Joe Brown: "Sure...but you got a J-O-B?

Crackhead Girl: "Yeah, I let men have liquid explosions in me."

judge Joe Brown: "You call that a J-O-B? You need to T-C-B and get a real job! Now get your crackheaded ass out of my court! YOU SMELL LIKE HOT GARBAGE!

make that ass clap/let it slap/talk to me now

You should "TCB". used as an abbreviation in text messaging.

Bart: Who are those pleasant old men?
Homer: It's BTO -- they're Canada's answer to ELP. Their big hit was TCB.
(long silence)
That's how we talked in the '70s. We didn't have a moment to spare.