to flounder

Laying on top of another person (usually your loved one), making yourself as heavy as possible, to squash them under your weight.
Done to either show affection or punish someone for their derpy behavior.

The true definition of a flounder is a shapeless woman who has neither breasts nor an ass. She is thinly shaped up and down much like the fish.

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.

Extremely intoxicated

Floppy empty tits

Tits like 2 flounder fish. The type that need a belt rather than a bra

A flounder is the act of pushing one's buttocks together while standing and defecating, resulting in two brown smears forming on each of the buttocks. These smears each are flat, brown, and circular, much like the shape of the flounder fish. Floundering is preferably done in the shower, so that one can simply rinse the flounders off when done, and no one has to know about it.