The hot-tempered anchor of "The Ed Show" lost it during a phone call in the packed studio and slammed down the phone before exploding.
As astonished MSNBC staff members fell silent, Schultz glared around the room and yelled, "[Bleep]ers!"
A witness told us, "Ed was furious the network was running election-night promos and he wasn't in them. He'd been arguing on the phone with marketing, then he slammed down the phone and exploded. It was like Mel Gibson had entered the newsroom."
Fuming Schultz was immediately dragged in for a meeting with NBC News President Steve Capus and MSNBC President Phil Griffin following his Aug. 12 meltdown.
Our source added, "Schultz was told: 'If you do that again, you are fired.' He broke down crying."