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3.
When co-workers engage in sexual intercourse
"What? Are you saying Susan had sex with Ryan in accounting?"

"Yes, they had intracourse."

"That's unbelievable."
by stevehappens April 26, 2009
 
1.
Masturbation.

The opposite of (or perhaps, precursor to) Intercourse.
"I was ready for an all-nighter with that redhead, but had to settle for intracourse instead."
by Mr C. December 10, 2003
 
2.
making beautiful,meaningful love to oneself.Or wanking into a dirty sock.Whatever...
I had the greatest time last night going out on a date with myself!By the end of the night I had my pants pulled down and was having sweet Intracourse with yours truly!
by Rod Fury November 19, 2006