When a person (typically a girl) sticks her thumb up man's butthole and flips around his balls between her fingers.
"Ryan just told me that Sarah's flopsy giving abilities are unmatched!
von IMW 5. April 2008
derived from the singer Ville Valo due to his curly hair and hat.A flopsy is always male and often has an arched back.
von pokie_orna 18. Dezember 2003
When a man and a women are about to have sex, but the man loses his erection when his penis contacts her vagina
"Man I was about to get some last night but I went flopsy."
von Mcdrizzle 13. Februar 2010