Pants that are normally worn for comfort or relaxation (usually grey). They are so comfortable that the wearer often mistakes the material for Koala fur/skin. People wearing such should not be disturbed.
"Hey, I was going to ask if you wanted to go for a ten mile run, but I see you're wearing Koala Pants, so I'll come back at a better time"
by VenIggs October 16, 2011