Charlie Sheen to Rihanna -- How DARE You Reject My Girlfriend, You Idiot

11:03 AM PT -- Now it's war ... Rihanna just responded, tweeting, "Goooorrrrrrlllllll......If that old queen don't get ha diapers out of a bunch..."

If that old queen don't get ha diapers out of a bunch...

— Rihanna (@rihanna) May 22, 2014

Rihanna better run for cover ... because she just made Charlie Sheen's s*** list in the worst way possible -- after rejecting Charlie's request to introduce his fiancee to the singer.

Charlie just launched into a tirade on Twitter, describing his sour encounter with Rihanna Wednesday night at the ritzy Giorgio Baldi restaurant in Santa Monica.

Charlie said he was there celebrating the birthday of his fiancee Scottine (formerly Brett Rossi) ... and when he found out Rihanna was there too, he sent a request to the singer's table for a meet-and-greet ... because Rossi's a big fan.

But Charlie says his request was DENIED -- "there were too many paps outside" -- and now, the Warlock is back with a vengeance.

Sheen wrote, "Nice impression you left behind, Bday or not. Sorry we're not KOOL enough to warrant a blessing from the Princess (or in this case the Village idiot)."

Then he unloaded on Rihanna's wigged out get-up -- "Halloween isn't for a while. but good on you for testing out your costume in public. it's close; a more muted pink might be the answer, as in: none."

It's all gold. Click below to read the full thing.

Charlie's Rihanna Rant

so,
I took my gal out to dinner
last night with her best
friends for her Bday.
we heard Rihanna was present as well.
I sent a request over to her table to introduce my fiancé
Scotty to her, as she is a
huge fan.

(personally I couldn't pick her out of a line-up at gunpoint)

well, the word we received back was that there were too
many paps outside and it just wasn't possible at this time.

At this time? AT THIS TIME??
lemme guess, we're to reschedule another random
11 million to 1 encounter
with her some other night...?

no biggie for me; it would have been 84 interminable seconds of chugging Draino and
"please kill me now"
that I'd never get back.

My Gal, however,
was NOT OK with it.
Nice impression you
left behind, Bday or not.
Sorry we're not KOOL enough
to warrant a blessing from
the Princess.
(or in this case
the Village idiot)

you see THIS is the reason
that I ALWAYS take the time.
THIS is why I'm in this thing
31 awesome years.
Good will and
common courtesy, carefully
established over time to exist radically in concert
with a code of gratitude!

I guess "Talk That Talk"
was just a big ol lie from
a big ol liar.

oh and Riahnna,
Halloween isn't for a while.
but good on you for testing out your costume in public.
it's close; a more muted pink might be the answer,
as in:
none.

See ya on the way down,
(we always do)
and actually,
it was a pleasure NOT
meeting you.
clearly we have NOTHING
in common when it comes
to respect for those who've
gone before you.
I'm guessing you needed those precious 84 seconds
to situate that bad wig
before you left the restaurant.