verb, also with n. forms. To be urgently requiring a dump, perhaps turtling or touching cloth, but having to pass a series of trials first. Since in this context you feel like you have a bomb in your intestine, it thus evokes feelings of being in the DS Visual Novel/Puzzler 999: Nine Hours, Nine Persons, Nine Doors.
Friend: Why'd you shit your pants, Joey?
Joey: I really needed a shit, but my dad started to write me up about the porn on my sister's computer. I was Triple Nining it for ages.