you get naked (most likely while under the influence of some drug or alcoholic beverage) and just take it from there.
"yesterday i got soo crunk me and angela played the naked fun game i don't even remember what happend!"
by alex0001 December 4, 2007
An any time of day activity you can enjoy with the person of your choice, preferably after some brazilian waxing.
Greg-O: "Chuck!! Where the hell have you been?"
Chuck: "Oooooooo. I been home havin some butt naked fun with my old lady!"
Chuck: "Oooooooo. I been home havin some butt naked fun with my old lady!"
by Princess of the Pirates May 18, 2005