Rihanna is in over her head -- Charlie Sheen has just issued a biting response to the singer's "queen" jab ... mocking her subpar command of the English language.
Charlie issued the response to TMZ in (what else) poem format:
"Dear Ms. Rihan-
oh wait, no last name,
Okay, Dear R -
clearly English is NOT
your primary language.
Firstly I want to thank you for recognizing me as Royalty. I'm flattered.
do the good Queen a favor and go tend to the dungeon in my Castle.
But beware of the
rats and the snakes.
They stir with folly
awaiting your tepid advance,
in the shadows..."
It's unclear if Rihanna was being homophobic, but "queen" is commonly a pejorative term for gay people ... and Rihanna's been in trouble before for allegedly bashing gays ... so we gotta ask ...