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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!!
arching by Oh-Me-Oh-My July 11, 2007

arching your back 

When a flat girl arches her back to make her look like she got curves.
Why are you arching your back like that?
Oh I just need to make me look like I have boobs and a butt.

Arching it 

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."
Arching it by Fredh2o September 1, 2013

archwired 

A term meaning "I have braces on my teeth," created by the readers of ArchWired.com, a website for adults in orthodontic braces. The term is freely used on the website's message board.
"After seeing my orthodontist and getting molds and x-rays, I finally got archwired today!"
archwired by SusanDooley October 24, 2007

sex arching 

When a girl is sitting on your lap facing you (naked). Then she does a backbend till her head touches the floor. Allowing you to massage her frontside!
"Dude I went over to my girls house and she was sex arching on me, it was great!"
sex arching by bear_9191 August 16, 2011
A term used to describe two people madly in love but won't reveal their true feelings to each other in person. They communicate through their endless texting and facetime fantasies while also maintaining a professional relationship at school. Together they work their chemistry in their physics class with Becky and blossom their unknown eternal love and romanticism.
Archinita is such a perf match omg! Even Krishna would think twice before splitting these lovers apart.
Archinita by heeeelllooooooo November 29, 2017