She has a reputation for being 'good/great in the sack'. [=for being a good sexual partner]
He's ready to 'jump/climb in the sack' [=have sex] with any woman who'll have him.
The company 'gave him the sack' [=fired him] for improper conduct.
(..) -Take me minutes. -I'm warming up the band now. No I didn't, look you can't fucking do this to me! -Can't?! -Yeah! When did you become a fucking expert on what I can or cannot do? You fucking weepy-willow shit sack? I earned that part. You never earned anything. God you're a self-righteous prick (..)2014 Whiplash