LOL! GAYLE KING SAY'S HER & OPRAH ARE NOT LESBOS!

They fish together ... they camp together ... they shack up together .... but Oprah's BFF Gayle King still insists the famous lesbian rumors are purely "ridiculous." Gayle and her daughter Kirby hit the Museum of Modern Art in NYC last night -- when she said that she's never put out a gay vibe with the famous talk show host ... because "there isn't one."

Can't two single, middle-aged women hang out in peace? All the time? Without men? Ever?