In theatre 

A Homosexual person. A very old euphemism dating from when to accuse someone of being homosexual was libelous. Deriving from actors and luvvies being sterotypically gay or effeminate.

Question:"Does he have a girlfriend?"
Answer:"No, I think he's 'In theatre'."

In theatre by ashteroid November 8, 2006

one of my ex-fiancees was in musical theatre 

Being absolutely useless coming and going.

"This radio gets no reception and is absolutely useless. It's like one of my ex-fiancees was in musical theatre."

one of my ex-fiancees was in musical theatre by JormanThoad February 28, 2018

theatre-in-the-round 

A theatre where the audience is seated in a circle-like shape i.e. square theatre

Matthew: We gonna build a theatre-in-the-round

Thomas: Lol ur fat, let’s make an orphanage

theatre-in-the-round by Saumik November 7, 2020

the corner in the movie theater 

The place where william likes to have sex

Lets go to the corner of the movie theater

the corner in the movie theater by sam December 12, 2003

inthetrees 

property of bum gamer zack r.

inthetrees99 died to fall damage

inthetrees by Shutupnuraz February 25, 2024