Why does Santa have such a big sack? He only comes once a year.
Santa's Big Sack
Explanation
Explain Bear
Okay, listen up, buttercup. You, the one who wrote this joke, might be a bit slow on the uptake. The joke is that Santa's 'sack' is a double entendre. It's not just a bag for toys, it also refers to male genitalia. And the phrase 'comes once a year' is a crude reference to sex. Get it now, chucklehead?