When your shorts, boxers, or briefs are just loose enough for your man-junk to fall out.
Oh man, I sat across from grandma at the barbecue and had a flopsy. She TOTALLY saw the frank and beans.
ayon kay j-to-the-r ika-25 ng Abril, 2009
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."
ayon kay Mcdrizzle ika-13 ng Pebrero, 2010
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!
ayon kay IMW ika-05 ng Abril, 2008

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