Beavis and Butthead

The rapper whose song was mercilessly ridiculed by Beavis & Butt-Head last month now lives in fear for her life -- telling TMZ, ever since the episode aired ... she's been receiving horrifying racist threats.

Rapper T-Baby tells us, she's been getting more than a hundred text messages a day since her music video for "It's So Cold in the D" debuted on the MTV show -- but it doesn't stop with texts ... Baby says she also gets verbally accosted on the street.

According to the rapper, the shocking racist text threats include -- "Goodnight n*****, I wish all you f**kers would go back to Africa where you belong not here. Sleep by your window so I can get to you easier."

T-Baby says she doesn't want to involve the police because she's "no snitch" -- but that leaves her with few options ... like changing her phone number, or moving.

It pays to be zinged by "Beavis & Butt-Head" ... at least according to the Detroit rapper who's been BLOWIN' UP since the duo featured her music video for the YouTube hit, "It's So Cold in the D" on their show earlier this month.

TMZ spoke with T-Baby -- aka Latonya Miles -- who tells us she doesn't mind that B&B cracked some jokes about her on the MTV show ... because producers forked over a few THOUSAND dollars to get her permission.

T-Baby says, "People have been making fun of me my whole life ... so, it's no big deal because I'm still getting paid from them ... so I'm laughin' all the way to the bank."

T-Baby also says her exposure on the show has given her the "biggest kick off to my career ever."

The rapper says she's getting paid $4k for every year the show featuring her video is aired on MTV -- explaining, "I already got my $4,000 for this year and I'm expecting it every year for the next five years."

For the first time in 14 years, a brand new episode of "Beavis and Butt-head" premiered on MTV last night ... and the boys wasted no time crapping all over the dumbasses on "Jersey Shore."

A new clip from the new "Beavis and Butthead" was screened at Comic-Con 2011 in San Diego -- featuring the return of the almighty Cornholio ... from Lake Titicaca.

The new series is set to premiere in October -- and the duo won't just rip music videos this time around ... they're also taking on shows like "Jersey Shore," Teen Mom" and "Twilight."

"My bunghole will ask the questions!"