The Chattanooga Lookouts are a minor league baseball team affiliated with the L.A. Dodgers ... they're also the only team with a picture of a naked man's tattooed ass hanging in left field.
This photo was taken yesterday at AT&T Field in Tennessee ... showing what appears at first glance to be a harmless ad for Champy's Chicken right near the scoreboard.
Upon closer inspection ... turns out the Champy's logo is actually a tattoo that happens to be located on the right ass cheek of a very big Champy's fan.
A rep for the restaurant tells TMZ ... Champy's gave the ass model $200 in store credit so they could use the shot in their ads. The credit was all up front ... so, the model gets nothing in the back end (rimshot).
We're told the ad has been up at the stadium all season long and it hasn't been a distraction ... in fact, the Lookouts are currently in 1st place.