1. Greetings to a friend or a large crowd to announce your arrival.
2. Can be used as a pronoun to get a persons attention without saying their name.
3. Celebratory; Elation; Happiness 4. Used to described illegal substances such as narcotics.
"HEY Whodaba", he shouting to the party as he walked in the door.
"Watch out Whodaba, I have a hot plate in my hands"
"Hey man, that was some good Whodaba the other night, got anymore?"
A nonsense substitute word used when you don't know the proper term for something or simply can't remember it. Derived from "Who'd have thunk it" and "what's this?".