Standing For Best Friend Sword, Purchasing this item makes you best friends.

when you're hungover as shit after a spending a night drunk as a skunk

Big Fucking Sword. A common fantasy trope. This is usually the weapon carried by the protagonist. Can symbolize the burden the hero has to carry, but also the ridiculous amount of power they have. You can find B. F. Swords used in most many popular media these days (anime, videogames, comic books) , with characters like Cloud Strife from Final Fantasy and his Buster Sword, Guts from Berserk or the Odinsword from the Thor comics. This concept probably originates from the Excalibur myth.