If you are experiencing an issue where bodies are "dropping" through the floor or causing the game to lag, this is a common physics engine bug in browser ports.

In the context of these games, a usually refers to a specific tactic or a glitch involving the character's hitbox or ragdoll physics after being eliminated.

Here is a breakdown of that mechanic and a "useful feature" to help you utilize or counter it:

For a Game Website (Description) Body Drop 3D