Top Definition
acronym for-all night sex fest.

usually describes evening with multiple concurrent and/or, consecutive sex partners at orgy, backroom, darkroom, sauna etc.
"Oh man I'm so tired, rolled home at 6am after ANSF."

Useful acronym to use in work email that filters out "sex".
by SJP2010 October 18, 2009
5 Words related to ANSF

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