When you extend an invite to a group of people in a room and there are people there you don't want to invite, but have to because it's the polite thing to do.
A: what the hell is he/she doing here?
B: collateral invite.
A: oh. i'm sorry.
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Having sex with someone when you honestly didn't intend to, or are trying not to. Not always a bad thing and is no big deal because 'hey, accidents happen'.
I went over to my ex's place to drop off some stuff last night. We got talking, one thing led to another and we had accidental sex.
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