The place in a club, most common a gay club, in which sex happens

A person who gets the vaccine and and flaunts it will high end shopping, trips, and parties

the place in the back of a building where you go to fuck someone or where you get raped

A back room can be defined as either a sex room or a game room.

When it is a sex room, the partners, or party, partake in "activities" of which genitalia meets genitalia. This is often referred to as back room sex.

When it is a game room, the user of this room participates in playing various video games. This is often referred to as back room gaming.