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
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug