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1.
A very sneaky foreplay moved performed by short Jewish guys from Long Island. Not realizing that the girl is not into him while sitting on her couch, the dude places his hand in between the girl's thighs and flaps it back and forth in the same motion as a fish out of water. The flounder is normally followed by dog-like leg humping.
If performed properly, the flounder-leg hump trick is good way to ensure the "No Pants in the Bedroom" rule is followed. If awkward while doing this move, the dude is usually sent on his way hoping to catch the end of Rosh Hashanah dinner.
"When Yaacov tried the flounder, the date was over."

"I wasn't into Isaac at first, but, after he floundered me, I got to see that my pants really did match the rug...and he found out the color of the carpet"
by Irish-Italian Manwhore September 25, 2006