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v. When a Homestuck cosplayer paints or colours themselves grey for a troll costume.

n. A troll cosplay/ makeup can be referred to as a 'greyface.'
1. "I was thinking of putting on my Karkat costume for the meetup, but it's going to take way too long to greyface. I think I'll just Dave instead."

2. "Once I put on my greyface at school and I got in so much trouble, but I wasn't even wearing a wig or anything."
Greyface by BluhBluhHugeWitch January 15, 2013
Anon asks on Tumblr, named as such due to the grey face icon that appears next to the ask message. Is generally value-neutral, but some Tumblr users use it strictly in a more pejorative term with regard to anon hate mail.
Anon: "Your blog is so stupid. Do the world a favour and kill yourself."

Tumblr User: "You're so cute, greyface - thinking that your hate mail could possibly upset me."
greyface by Tumblrina December 29, 2013

greyfacing 

This is something you say and no one knows the true meaning behind it. It is something you say when the conversation goes awkward or when you’re bored. It was originated by snapchat user Lisa Nightingale.
I hate you because you keep greyfacing.
greyfacing by wjohntucker December 18, 2018
A grey face is a person, who is confident in just fulfilling the typical ideas of being a member of society. Working, consuming, not questioning anything.
People which adopt the ideas, believes and so on they are told to believe.
similar to a tool
spawns from discordianism
"We must support the Bush administration!"
"Why?"
"Because they need us to be patriotic, no matter what it will cost us..."
"Fu*king Grey face!"
grey face by Terrick November 24, 2007

grayface 

grayface by Eris July 23, 2003

Greyfaced Greyling 

A breed of dog that is a Austrailian Dingo and A Greyhound combined domesticated.
Run Ronnie run and go catch my Greyfaced Greyling.