Someone who uses words as different meanings at different times. These peaple will have secret or non-secret meanings to the word with different peaple.
Dude one: "Did you see Mat today! Hes such a toob!"
Dude two: "You used that new word on me earlier! What does it mean!
Dude two: "Well when im using that word on you, i mean total noob. When on Mat im referring to a tool+noob"
Dude one: I never expected for you to be a Mega Word Switchup type.