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This is when you have some sort of accident or injury during a sexual encounter.
Last night I broke my nose in a sexcident when I tried to change positions.
by tiva23 March 26, 2013
The action that results in the sex stopping and immediate application of first aid.
I totally tore my sack in this wicked sexcident.

So I was going at her with this canine dildo when we had a sexcident and suddenly there was blood everywhere.
by Ludaphisk March 21, 2012
a "sex" "accident," or an unintentional one-night stand
I had a "sexcident" last night... sure didn't mean for Bobby to make it home from the bar with me!
by Calamity Jane Doe August 28, 2008