A term used to describe someone who mistreats things and/or breaks things often. Everything they touch turns to crap (hence STOMACH hands). Could be used in lieu of butterfingers.
If you give your friend a ride, don't let them slam the door. They have such stomach hands!
You shouldn't wash the dishes tonight. I don't want your stomach hands breaking my new china set.
Aww, crap! You broke the remote already? Get your stomach hands away from my things!