The floppy donkey is when a guy spreads his legs slightly while standing and thrusts his hips back and forth furiously resulting in his pecker swinging back forth like a pindulum. The floppy donkey is most effective while wearing gym shorts or sweat pants!
A person who is unable to successfully move their limbs due to extreme tiredness.
Conversing with said person is useless due to floppy donkey also affecting the brain.
To move someone who is a floppy donkey is close to impossible.