A guy or gal who drops loads of cash into a freemium game. They are the reason 90% of all freemium games exist after their first month.
You: Dude did you hear about the cash whale that supported that one game?
your Friendo: yeah, heard they dropped stacks on the developers daily
You: yeah, speaking of which you wouldn't happen to have some cash I could borrow, would you?
Friendo: Nah man, i'm a couple thousand dollars in debt, why do you think i'm mugging you?
The action of writing on another's face. popularized by the pokemon jigglypuff.
person 1: dude, did you see Joe? he has a dick in sharpie on his forehead.
person 2: yeah, he got jigglypuffed.