When you drunkenly fuck a slut in every hole possible and then after she falls asleep you sleep walk over to your friends bed and piss on them. Generally applies to a hotel/vacation home.
Jim's bachelor party in Atlantic city was a fucking blast! Too bed Ryan pulled a dirty nancy on jeff and bach..
"That girl is HOT!" - Guy #1
"Dude." - Guy #2
"What?" - Guy #1
"She is a Dancing Nancy." - Guy #2
"A what?" - Guy #1
"A transvestite prostitute." - Guy #2
"Dude. Eww." - Guy #1
"I dunno... I'd still tap that." - Guy #2
"Dude. No." - Guy #1
The act of giving a rim job with a Frozen dessert. Such as Italian Ice, Ice Cream, Frozen Yogurt, or Gelato.
Usually performed by a woman over the age of 45.
Grandson- "Hey I was at my grandma's house and I walked in on her and her neighbor Performing a Fancy Nancy"