Needing to urinate.
* quaff wonders why there are words like hungry and tired but not ones for things like "has to piss"
<quaff> that doesn't seem right, but I can't think of anything better
<quaff> that could work, though it's formal sounding
<quaff> "I'm apisstuated, therefore I'm going to go urinate."
I'm apisstuated, therefore I'm going to go urinate.