A belly boat , or U-boat, is basically an innertube-type of fishing craft that the angler sits in while his feet hang below. Generally, you're wearing waders because you're essentially waist deep while sitting in the water. You have flippers strapped onto your feet so you can putt around--albeit backwards.
I borrowed my friend Peter's boat today and set out for a little lake in the Boulder city limits. On about the fourth or fifth cast, I hooked up with a really substantial fish. That fish ended up being a 22 inch walleye.
I putted around for a few hours, chucking big streamers with my six weight. Got several bass to hit--one going around 4 pounds.