Moob Jam Share definition Flag where a fat person does not clean under their moobs and gets all gunk their, like what happens with your toes when you get toe jam. eww, gross! dude, you have moob jam! do you not clean under your moobs at all?!?! Moob Jam by Tom Rowen May 12, 2010 0 0 Get merch Get the Moob Jam mug. Buy Now — $32.95 See more merch