Definitions by DutchRub
belly
Short for belly up. Originally from fisherman in the northwest. Denotes a dead fish, which float belly-up. Shortened to "belly" due to familiarity of the term. Refers to fishing conditions or condition of the boat or even the captain and crew.
ass fact
A stated opinion that isn't true. Rather, just pulled out of the ass. When an ass fact is stated, one has the right to call "ass fact" on the person who delivers the untrue statement.
bi butt
similar to a fupa (Fat Upper Pubic Area) or bif, (butt in front), from the waste down, you can't tell whether if a bi butt is coming or going. A true bi butt actually has two fully formed butt cheeks on each side, two in front, two in back. The front or rear plumber's crack is optional and generally not visible, since a bi butt's pants tend to be belted across mid stomach area or even higher in some cases.