A booger that immediately vanishes upon blowing it out.
It is usually found by someone else hours later, stuck to some conspicuous place on your body.
"Hey, Jim! You've got a big snot on your shirt!"
"Damn that mystery booger!"
Buy a
mystery booger
mug!
A booger that covers all of the inside of your nostril. When blown out, it is usually round and sometimes bloody.
"Ooooh, I just blew out a big stopper."