(verb) The condition of one's limbs going limp, causing one to spontaneously fall to the ground from a standing upright position, as a dead fish would. This action follows someone directing the command "dead fish" towards an unsuspecting victim. The goal is to make the "dead fish" feel as awkward and embarassed as humanly possible.
"Wow, Kate Morris just got dead fished in front of the entire boys' soccer team. She looks like an idiot."
"I just got dead fished in front of the entire mens' lacrosse team. I'm going to go kill myself now"