3rd world 6 pack Share definition Flag a really skinny guy who is so skinny his underlying muscles on his stomach make him apear asif he has a proper 6 pack. dude, that kid is so skinny, i bet he has a 6 pack. 3rd world 6 pack by Jack G. May 31, 2005 0 0 Get merch Get the 3rd world 6 pack mug. Buy Now — $32.95 See more merch