Ton-o-Fun Share definition Flag A women who weighs more than 250 pounds and/or is visibly overweight to the point where she is no longer just fat. You see that women over there, that is what you call a ton-o-fun. Ton-o-Fun by A-Man March 31, 2005 0 0 Get merch Get the Ton-o-Fun mug. Buy Now — $32.95 See more merch