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When someone (very typically a male) acts in a way that is usually representative of a female. Can also be applied to express general disgust or discontent at one's actions. See examples below for clarification.
Matt: She was never into him in the first place. I can't believe that he's still upset about me hooking up with her; he's been boxing out for an entire week now.

Darryl: Nah, he's not coming out tonight. He's staying in to play video games. He totally boxed out on us.

Brice: He said that he MIGHT show up. Chances are that he'll just box out.
Box Out by Brice James August 28, 2007
When a girl gets cock blocked or prevented/interrupted from obtaining sexual contact with a man.
I was super into that guy, but my friend had to do that terrible box out.
Box out by Fierceone February 9, 2017

Box out a shordy day 

Today on the 17th of December, you’re aloud to box out any shordy you want. Even your grandma!

Pow pow bitch ass grandma you just got boxed out
It means that you can punch any girl you want in this day on December 17
“Why’d you punch your girl

It’s because it’s box out a shordy day”

get ya box out ! 

to ask a ladie to show her vigania.
ere' girl get ya box out !
get ya box out ! by plc pap pap January 5, 2010

coming out box 

Where an lgbt person has come to fing out about a ‘coming out box’, it’s just a joke to confuse the straights, but you didn’t hear that from me
Gay 1: “sis I got my coming out box”

Gay2: “omg queen what did you get”
Confused straight: “ a what?”

Coming out box 

An inside joke made by millennials that I was left out on. :(
"What did you get in your Coming out box?" "What's a coming out box"
Coming out box by Taytheditz June 24, 2020