Rob Gronkowski tried spitting bars (again) -- this time in rap battle form -- and got absolutely WRECKED by "Jane the Virgin" star Gina Rodriguez.
On "Drop the Mic" ... Gronk took the stage in a tank n' chain, bragged about his Super Bowl rings and dropped some cringy sex jokes on Gina.
"You're a Virgin, I'm not -- I score all the time."
Gina responded with a series of shots at Gronk's intelligence ... leaving the Patriots superstar looking legitimately hurt.
"I spit fire -- you look like the caveman that discovered it."
"Gronk's his nickname and we know what that means -- it's the only sound he made until he was 16."
And the KO blow -- "This is not a revelation, I'm sure you've heard it all. But check your manhood, 'cause I just deflated your balls."
Update: Gronk's ego has officially been placed on the IR.