The area on the body where a massive butt-like shape develops, crack and all. This is on the front of extremely fat people, where the genitalia should be.
Did you see the front butt on that guy? You couldn't tell if he was coming or going.
When ones stomach unflatteringly hangs down and out over the waist. Most commonly seen working behind fast food counters or shopping at walmart. Looks like a big ass in front. Often held tight with polyester.