Top definition
This word was created in an episode of Futurama.

This word means two monsters, aliens, etc. having sex with each other while standing up.
"I Guarantee That By The End Of This Night You'll Be Doing The Vertical Monster Mash"
by Soldier 91 January 24, 2005
Get the mug
Get a Vertical Monster Mash mug for your brother-in-law Callisto.