One who fails to attain or sustain a penile erection during sexual activity. A Floppy Dog is usually guilted into performing other sexual favours to make up for his lack of manhood.

Proceding the event, the Floppy Dog brags about being a stallion until the true word is spread (commonly by the poor girl that experienced the Floppy Dog).

Being under the influence cannot be used as an excuse for being a Floppy Dog.
Sven likes beer equally as much as sex with women. Unfortunatelly for Sven, he turns into a Floppy Dog after too much beer. Although one wonders if beer has anything to do with it at all..........
by Tong28 November 3, 2008
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The act of violently backhanding an unsuspecting male in the family jewels. This is done while the victim is standing, usually as the perpetrator is standing next to the victim or walking in front of the victim.
Travis in on the ground in pain because Rich gave him a floppy dog.
by AvieAlum February 3, 2018
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