Lil Scrappy and his mother, Momma Dee aren't taking kindly to accusations made by his ex-GF

Lil Scrappy and his mother, Momma Dee aren't taking kindly to accusations made by his ex-GF ... Scrappy tells TMZ Diamond is a "lying industry ho" who's as fake as her phony teeth and butt.

Diamond gave a radio interview Friday blasting Scrappy -- accusing him of physically abusing her -- and claiming Momma Dee stole her Louis Vuitton purses and ruined her credit by trashing a condo Diamond helped her buy.

Scrap tells TMZ Diamond lies like a rug ... saying he was never abusive and never once put his hands on her. Scrappy says she's trying to make herself relevant by throwing shade ... even though he gave her a start in music and bought "her $20K teeth and her fake ass."

He says Diamond's story of Gucci Mane slapping him down in a club is all BS. Scrappy insists they had a shoving match, nothing more.

And Momma Dee tells TMZ she never got anything of value from Diamond because "Diamond ain't never had s***."  

Momma says Diamond's a "lying chamber maid" who's mad because she's not banging the prince anymore ... and says Diamond will never have any money unless she gets a "douche deal for her stank-ass p****."

BTW ... sources close to Diamond says her ass is real and she paid for her own damn teeth.