(uncountable, games) A game or activity in which one or a group of players try to keep a footbag off the ground using only the feet. / (countable) The footbag used for such a game.

(slang, vulgar) The scrotum.

A sack made from burlap, used for agricultural produce.

An incompetent or inept person. / A perennial failure or victim of misfortune.

plural of sad sack

(games, racing) A race in which competitors stand in sacks or similar items and try to be the first to jump to the finish line.

Something to be suspicious of.

A waterproof fabric shell designed to slip over a sleeping bag.

(slang) To fall asleep, usually from implied exhaustion.

(idiomatic) Sound asleep, usually from a healthy exhaustion.