Ja Rule — I’m Real … HUUUUGE!

Apparently Ja Rule smuggled a couple of guns out of prison … “cause the dude is YOKED!!!!

The rapper just posted a photo to his Instagram page … showing off the jacked physique he built while serving out his 2-year sentence in a NY prison for attempted illegal gun possession and tax evasion.

The 37-year-old rapper was obviously hittin” the weights during his time in the big house … and clearly the hard work paid off …

Unlike some other prisoners we know …