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.
(..) Is that? Wow... A baby... "little buddy diapers." His name is buddy. He must've... Snuck into your sack at the orphanage. What do we do? So, Santa had a Decision to make, And fortunately, when it (..)2003 Elf