a sock you put on your ass whether you are cold or trying to catch fecal matter. word also commonly used for ridicule. a buttsock is also used to catch a fart and bring to ones face.
you are such a god damn buttsock
aw dude wtf did you have to buttsock me for, i can taste it
When you've had so much anal sex that your insides come outside. Resembles a pink sock hanging out of your ass.
"Did you know Jerry has a buttsock?? It's totally gross!"