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any accident that happens during sex.

For example:
breaking a lamp
stubbing a toe
shooting a load into the eye.
sorry about the sex accident last night.
by DanteM August 03, 2005
we had a sex accident now we have f**kin twins
by Captain Klamydia February 26, 2009
an unplanned for and undesired sexual act. usually proceeded by drug and/or alcohol consumption.
ew, you hooked up with him?
yeah, it was a sex accident.

i just wanted to go out with my friends but i ended up having a sex accident.
by hannah1357 February 24, 2008
something unplanned or unexpected occuring during sex
My parents had a sex accident resulting in my existence.
by unplannedparenthood March 26, 2009