Mama June Weight Loss -- 'Honey Boo Boo' Star LOST 100 LBS!!!

"Honey Boo Boo" star Mama June tells TMZ ... she's dropped more than 100 POUNDS in the past 2 years -- and claims she did it all WITHOUT DIETING OR A GYM!

The TLC reality superstar says she weighed in at 365 lbs when she first starting taping the show back in January 2011 ... but has since slimmed all the way down to a trim 263 lbs.

So what's her secret? June says she credits the whole thing to her active production schedule ... because she sure as hell hasn't cut back on the 'sketti, Ramen noodles and cheese puffs.

"I haven't done any surgeries ... no diet pills ... never went to the gym," June says ... "but with the show I've been more active."

She continues, "They have me running around and going different places ... I guess it's paying off."