adopted fortnite costume

Adopted fortnite costume is a derogatory way of saying that you don’t belong, or that you are out of style. It is a very popular phrase in gaming, but don’t get hurt if someone calls you an adopted fortnite costume because the person saying it is typically just as bad as the victim.

“Kid you’re such an adopted fortnite costume!”

Man in the costume

Figuratively it refers to a well known truth behind some concept (for example, "santa isnt real") that we collectively decide to ignore, because it ruins the fun.

It's in reference to mascot costumes worn by some poor soul to appease the masses, for example the underpaid part-timers staffing the costumes at disneyland

It's like, as a kid, pulling the "no, you didint just kill me cause we are just pretending" card when playing pretend on a playground

Alternatively, man behind the mask

Weeb A: you do know that most weebs are ironic about waifus, right? Only a relatively small amount of weebs actually think stuff like "this fictional high schooler is the love of my life".
Weeb B: Can we please stop talking about the man in the costume and get back to arguing about which underage girl is hotter?

costuming

/ˈkɑstum/

countable, uncountable the clothes worn by people from a particular place or during a particular historical period

costuming
The actors were still in costume and makeup.
She has four costume changes during the play.
He went to the party in a giant chicken costume.
a costume designer

Pulling in Allen crouch in a Batman costume

While standing in the closet dress is your favorite superhero with a with a hole cut in the crotch watching two people have intercourse you masturbate vigorouslyinto each one of their shoes while maintaining a tight clench on your DC or marvel butt plug. At the end you jump out and say something like Shazam or gee Willis Batman and run away shamed by what you have done Allen crouch

Did you hear that somebody pulling in Allen crouch in a Batman costume the other day not in a pair of f****** doc martens the disgrace the funny thing is is that the butt plug fell out and it was a hello Kitty one not a DC One