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In Theory 

Somthing cyrus says when he doesnt know what he is talking about, nut he plays it off like he knows. Any statement that uses this phrase is usually 99 percent accurate, i dont know how.
Me-"Hey Cyrus, how will mount the tv" Cyrus-"Well.....ummm......In Theory you can get tape and hang it"
In Theory by Riazi May 21, 2018

Brother-in-theory 

A would-be brother-in-law who is in a commited relationship with your sister but isn't legally married to her.

These relatives are awkward to introduce because they're not necessarily your friends, but technically not your relatives either. You don't want to insult him by going into detail about his relationship with your sister in public, but if you call him your brother-in-law, awkwardness might arise when people glance at the non-existent wedding ring.

This also applies to would-be parents and sisters-in-law.
Jack: Hey Ted, why don't you invite your brother-in-theory onto our softball team?

Ted: Are you kidding? Then my father-in-theory's gonna want to join too. There's a reason I didn't marry into that crazy family, ya know.
Brother-in-theory by Gossip Who? September 13, 2009

Hoe in theory 

A hoe in theory means that you would be a hoe if you were
Hoe in theory by Kurb43 February 26, 2017

gay in theory 

when a person often does a stereotyped gay thing to their sex, but isn't actually gay themselves.
he's into singstar, doesn't mind shopping and puts down the toilet seat. he isn't gay, just gay in theory.

"did jack just say he's getting into interior decorating?"
"don't worry about it... he's just gay in theory."
gay in theory by Citronic January 28, 2009

Favorite (in theory) 

Well, no, I said...
Hym "That Islam was my favorite (in theory) and in the context of their rituals (Pilgrimage and praying 5 times a day). It's something I enjoy in a scholarly sense. Humans aren't good at being consistent (in thought or action) so you'll have to forgive me.

In a theory

A game theeooorrryyy
Someone”in a theory
Me, who wasn’t listening”what?”
In a theory by codenamedoIphin December 4, 2020