Define Redefine Meaning

I posted a new entry in the Urban Dictionary and some redefiner posted the same definition under me.

Verizon has redefined its broadband service with the introduction of FIOS (Fiber Optic Online Servce).

I would love to Redefine on your face.

Redefining Douchebag: I think I'll post a definition of "douchebag" on Urban Dictionary.

Intelligent Person: But there are 219 definitions of "douchebag" there already. What do you have to say that hasn't already been said multiple times before?

Redefining Douchebag: Duhhh... I guess I could offer myself as an example...