Beeing lazy and watch tv or read and just do as little as possible when you could do other stuff. The reason for the term is that the catfish generally hang out on the bottom of the water, being lazy and doing all they need there without moving unnecessarily.

The phenomenon of internet predators that fabricate online identities and entire social circles to trick people into emotional/romantic relationships (over a long period of time).

Possible motivations: revenge, loneliness, curiosity, boredom

The term catfishing was inspired by the 2010 documentary "Catfish."

To have one large pubic hair protruding from one's zipper, whether purposely or by accident. The term comes from the long barbels, or whiskers that stick out from the mouths of catfish. While the whiskers of catfish house their taste buds and are used to search for food in murky waters, the act of catfishing will only serve to make you look like a complete slob, oblivious airhead, or creepy perv.