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1.
The act of having sex a second time after either poor performance during or lack of memory of the first encounter. A sexual "do-over."
"Wow. I swear that never happens to me. Smulligan?"

-or-

*YAWN "Oh .. hello ... who are you? We did what? I see. I don't remember that, can I have a smulligan?"
by Mopedkiller December 24, 2011