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Similar to sexual intercourse, but only involves the shins of both parties involved. Any contact with any body part other than the shin renders said shintercourse as void.
Jenny and I had some sweet shintercourse last night, so we didn't lose our virginity or get any STDs!
Robbie and I tried to have shintercourse last night, but our knees touched, so it was technically just sex.
When one uses their own shins to create sexual arousal/ spark orgasm, such as rubbing the genitals with the shin to result in climax.
Dude, rub your shin down my thick crease, I require shintercourse.