If you're out and you are flaunting it to those whom are in denial of your status. Context: when discussing the decision to wear cosmetics and the like and/or applying them in front of those whom do not now.
"My dad was trying to tell me to change and I was like ," Think twice! Im arching it out while you aren't looking."
by Fredh2o July 26, 2013
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Spitting or shooting out food from you mouth
dude he just arched on your food.
by fueledbyshawnn April 30, 2009
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To snap ones teeth at another person.
Jimmy looked at Patty and said "arch".
by Jonathan February 3, 2005
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Kind of thing usually said by someone drunk as an Irish and disgusted by something gruesome
Math: Man I tell you that waiter is fucking flirting with you!!
Vince: Uh.. really?
Mel: Yup!!
Kev: Yup!!
Math: YUP!
Vince: ARCH!!!!!!!!
by Mathieu Grenier October 4, 2004
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Joe: Where can I get some nasty food served to me by a 30 year old retarded guy?

Juan Pablo: the arches

Joe: You're right, let's go.

by funkyfingers22 June 26, 2008
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Arch is a slang term for the phrase Archracist; meaning (comparative more archracist, superlative most archracist)

Extremely racist and hateful towards anyone who isn’t white.
Person 1 - “Stay away from that guy, he doesn’t like colored people”
Person 2 - “Why not?”
Person 1 - “He’s Arch and doesn’t believe colored people should have freedom or rights”
by ConcernedActivist December 21, 2019
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Having sex in the St. Louis gateway arch tram car to the top.
I arched her about halfway up.
by norco22 June 26, 2018
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