He wasn't sure where Stu's head was but he, obviously, wasn't in the game. Billy had a competitive streak that came out in games like this. His attention was fully on the screen in front of him and not on Stu so he didn't realize the other had been staring at him the entire time instead of just focusing on the game. It managed to piss him off a little as he assumed Stu's thoughts were on Tatum.
He sighed as he paused the game and turned to look at the other before taking a drink himself. "I can think of a few things..." He teased, a little too buzzed to actually worry about what was coming out of his mouth or the way his eyes moved to Stu's lips for a moment before remembering he was supposed to be slightly annoyed. "You should call your girlfriend. Tell her you can't come over."