To rudely interrupt somebody while they are busy doing something important. Like T Pain did to Jay Z at Hot 97 Summer Jam, crashing the stage like shit is sweet. Later done to Jay AGAIN buy Lil Mama at the VMAs. This is where Jay coined the phrase, '' You T-Paining Right Now''.
You makin a business call tryin to get job or make moves and your girl tryin to argue with you or have a convo. Tell the B****to stop T-Paining you