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8.
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!
de IMW 5 avril 2008
 
9.
derived from the singer Ville Valo due to his curly hair and hat.A flopsy is always male and often has an arched back.
ooooh flopsies!!
de pokie_orna 18 décembre 2003
 
10.
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."
de Mcdrizzle 13 février 2010