1) The act of having to leave one's present location (house, apartment, yacht, etc) during a social gathering so as to acquire more beer. This typically occurs when the previous supply of beer has run dry, thus necessitating the need to "run out and get some more beer," i.e. "beer run."
(1) Candy: I didn't wanna say anything, but... is Mandy gay?
Andy: Uh, yeah. Duh.
Candy: OMG. That's cool if she is, but I'm totally not, and she was grabbing my butt all night.
Andy: Ohh.... right. Sorry. She's also a molesbian.
(2) Freddy: Aww, you have two pet moles! How cute!
Teddy: I think we can all see where this is going.