A depression in the cushion of a couch or chair formed by many hours of sitting. First known usage by Homer Simpson.
Don't sit in my ass groove! You'll mess it up.
kelly tarafından 12 Eylül 2003, Cuma
See Butt Marks
Ass grooves were left from sitting on the coach all day.
dwayne tarafından 12 Mayıs 2004, Çarşamba