lock door 

A party or an engagement where a group of females are made available to a group of males to perform sexual acts at a cost. Usually this type of activity is illegal and the person(s) running the engagement are forced to lock the doors after all of the participants have arrived.

Yo! I just heard about this lock door, tonight. You wanna go?

lock door by SharifB February 27, 2008

lock-door bathroom 

A bathroom with a door that locks. These bathrooms are not meant to contain more than one person in them at a time. Even if one person is only washing his/her hands it is considered taboo to enter a lock-door bathroom.

Commonly found in convenience stores, and fast food restaurants where space is limited. These can be found in a variety of modus operandi including, but not limited to, unisex, and handicapped.

"Brandon, don't go in that bathroom. It's a lock-door bathroom and someone is already using it. You don't 2-person in a lock-door bathroom."

lock-door bathroom by Che Stevini October 5, 2009