Cleveland legend Bernie Kosar was booted from his radio gig with the Browns on Sunday ... and it's all because the ex-quarterback bet on his former team to beat the Steelers.
Kosar -- who played for the Orange and Brown from 1985-93 -- placed the $19,000 wager (in honor of his jersey number) with the Tipico Sportsbook app last weekend ... becoming one of the first legal bets placed in Ohio.
The former Pro Bowler claimed if Cleveland (+120 in most sportsbooks) ended up beating Pittsburgh, he would donate the winnings to charity.