How badly does Mike Vrabel wanna win the Super Bowl?? Well ... the Tennessee Titans head coach says he's fully prepared to part ways with his Johnson in exchange for a championship!!

Okay, full disclosure -- pretty confident the dude was kidding .... but he definitely said it and now it's on the internet forever and there's nothing he can do to take it back.

So ... how'd we get here?? Vrabel was talking with his players, Pro Bowler Taylor Lewan and Will Compton, on the "Bussin' With the Boys" podcast ... when he was asked if he'd make the ultimate sacrifice and chop off his dong in exchange for his first ring as a head coach.

"Been married 20 years ... yeah, probably," Vrabel says.