Foxx was sporting an Emmitt Smith jersey during the celebration.
"I told y'all," he said. "Don't ever go against us. We dem boyz. I told y'all ... and Stephen A. Smith, first of all, you have to understand that the Cowboys are America's team and now you understand why."
Smith, an analyst on ESPN's First Take, predicted the Saints would beat the Cowboys 45-21 on Thursday. Dallas ended up winning 13-10 in an upset. Smith sported a cowboy hat and a Drew Brees jersey on the set of his show on the morning of the game.
"See the nonsense I have to deal with from these sorry Cowboy Fans ... like Mr. Foxx," Smith wrote Friday on Twitter, reposting Foxx's video.
The Cowboys now sit in prime position for a playoff push, leading the NFC East with a 7-5 record. Dallas hosts the Philadelphia Eagles in Week 14.