Slang for intercourse, so called because of the extreme curved posture of the back in the throes of passion.
Two drinks and this girl and I will be arching all night!!
by Oh-Me-Oh-My June 14, 2007
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arch, to arch /ahrCH/
verb transitive

to desire to cause harm, foil plans, and generally create aggression against targeted individuals or groups, used esp. with supervillains
We go around "arching" people at work.
by Dr Girlfriend October 26, 2011
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Claims he is a good boy is a thot. Invites you over and gives you his hoodies then says you should stop talking. Very low temper will get mad easy doesn't matter if he is a cunt to you. Knows exactly what to say and will have you on his knees no matter what he does.
¨damn was that Arche Harris
¨yeah heard hes got all the ladies for him¨
gay
by yoandjy10 May 31, 2018
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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 25, 2013
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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 03, 2004
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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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