A Lead Belly is a term used for an individual with a very strong stomach.
Or in other words its a term for someone who can eat anything and not get sick or die.
Marino: Yo Pasqua! You know that Michael guy? we gave him a sandwich that was filled with rotten sardines, sawdust and dirt off the floor, and he finished it and asked for another!
Someone who is able to consume large amounts of stuff that is bad for your health without dying
That person drank 4 glasses of methanol and he just showed up the very next day with no clue what we did to his drink, he obviously has a lead belly we should take more drastic measures.
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.