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Coitusing is a sneaky way to say fucking using the Latin base instead of English. Coitusing was devised for use by 'The Big Bang Theory' television show.

Coitus {Latin}: (n.) 'Sexual union between a male and a female involving insertion of the penis into the vagina.' ie. Sexual intercourse or Fuck
Sheldon (to Penny): "It was a lot of work to accommodate you in my life. I'd hate to think that effort to be in vain."

Penny: "You're just coitusing with me, aren't you?"
by Miq2u December 03, 2012
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