bat in the cave 

A reference term for when you have a booger in your nose that is clearly visibly from the outside.
This context is found in an episode of Sex and The City.

Hey buddy, you have a bat in the cave. Need a Kleenex?

bat in the cave by Scott November 2, 2004

Bat in the Cave 

An obvious booger in one's nostril.

While touching your own nose, you say, "Hey Pal, you got a bat in the cave."

Bat in the Cave by SlimSloomy January 6, 2005

Bat in the cave 

When a man forgets to do up his zipper

Mojo thought he had his 'Bat in the cave' until Nikki pointed out that his bat was about to fly out

Bat in the cave by Laaa July 19, 2007

Bat in the cave 

When u gotta poop and you feel it coming out and have to rush to the toilet to release the beast! LOL!

I give this definition credit to my good PAL kelly h.
"Kelly has a Bat in the Cave and needs to get it out fast before it flies out" lol, i dunno!

Bat in the cave by B-Dizzle November 1, 2004