1. Drinking enough whiskey to be at the verge of passing out and then having sex. Heavy breathing on your partner is mandatory, vomiting on them is optional.

2. The worst thing you can do to someone.
1. Dan went to the bar and after drinking six shots of whiskey in ten minutes went to his girlfriend's house to have whiskey sex during which he breathed on her a lot and possibly vomited next to her.

2. Whiskey sex is the worst thing you can do to someone.
by Shavool December 8, 2005
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While trying to perform the act of surprise sex only to discover that you are extremely intoxicated, having "whiskey dick", and therefore disappointing the suprisee and shaming the surpriser.
MO: "So Tara what did you last night?"

TARA: "Neal, this guy I met at the bar last night, tried to surprise sex me after I brought him home, but he drank so much he couldn't get it up."

SHANNON: "Woaah, that was a major case of Whiskey Dick Surprise Sex!"
by Monnon September 25, 2009
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