'Black Ink Crew' Shop Owner -- Receptionist Wasn't Drugged ... She's a Drunk Slut

The former "Black Ink Crew" receptionist who claims in a lawsuit she was roofied on the show is a DRUNK and a LIAR ... so says the owner of the tattoo shop.

TMZ broke the story ... Alex Estevez sued producers of the VH1 reality show, claiming someone connected with production roofied her on the set back in 2012. She says she blacked out and acted the fool, but producers made her look even worse in the editing ... she thinks she came off as a slut.

But shop owner Ceaser -- whom Alex tried to seduce during the episode in question -- isn't buying it ... telling us, Alex was 100% under the influence of alcohol and nothing else ... and it was her own doing

He adds, "Ain't no one give her s**t. She was drunk off Henny. You can see from her behavior no one gave her any drugs, or tried to make her anything she's not."

As for the slut allegation, Ceaser says, "You don't have to give a slut drugs to do what she naturally does."