SHART:

A cross between farting and dropping a load in your pants. Typically of a runny consistency. There are 5 categories of Sharts. Also known as a Foop.

Cat 1) Wet Sensation
Cat 2) Wet Underwear
Cat 3) Soak thru to inside of pants
Cat 4) Soak thru pants (Visible to general public)
Cat 5) Runs down to socks. (Oh my god, run for your life)

Anything of Category 4 or higher require showers. The lesser categories can be dealt with using alternative cleansing methods.
On the way back from lunch yesterday I noticed Art was having a hard time making it up the stairs. As we reached the pinnacle of the staircase Art looked to me and said "You gotta cover for me, I just Sharted". He then wiggled out of the building and drove home for a shower.