a level of inebriation that extends well beyond that described as "shitfaced," such that bowel control is lost. Typically achieved by drinking on an empty stomach. The exact Blood Alcohol Content required to reach "shitpantsed" drunk is different for each set of bowels.
Cole didn't eat before going to open bar, and wouldn't you know he ended up shitpantsed in the bathtub.
Carl wanted to show everyone he could loosen up, but he'll never live down getting shitpantsed in front of everyone at the holiday party.
A fashion disgrace commonly seen in inner city ghettos, trendy hip hop videos, and white/wigga neighborhoods where a gangsta or wannabe gansta busta-brown wears loose pants that look like they are carrying a bag of shit in their ass cuz they hang down so low. Also known as gangsta pampers.
"Excuse me sir, but you can't possibly hope to get a job with us wearing shitpants."