BatCave 

Take a Girl into a room shut off all the lights. Shine a Flashlight in the air and say "To The Bat Cave Dundundun" Then ram her in the ass/pussy ur choice

She came over last night and I BatCaved her ass

BatCave by Brotherhood477 May 12, 2016

Batcave 

When your hitting your girl from behind you light a flash light and point it at the roof and when she looks up you scream " TOO THE BATCAVE" then stick your dick in her ass

My girl is mad at me i batcaved her last night

Batcave by Dankest memest April 20, 2018

Melvis Batcave 

Someone who looks like a Mexican Elvis who has a larger than usual anal cavity due to years of being rammed full of large cock.

Q, why is Melvis walking funny?
A, he had a party in his Melvis Batcave last night.

Melvis Batcave by The-mess May 31, 2016