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 19, 2005
Get the butt naked funmug. by Cactusman34 January 8, 2016
Get the butt funmug. the top most level of happiness there is to exist. simply means “have a great time and so much fun” while three guys cum in your butt
100% one of the most fun instances those guys will ever experience
100% one of the most fun instances those guys will ever experience
by DRAWEEWEE September 1, 2021
Get the three butt loads of funmug. 
