a Hubel is an idea, that probably wont be realised, but it is fun to talk about this idea.

"Somebody should do this" or "maybe I'll do this when I have time for it" are clear indizes that you are talking about a hubel.

also a common term is to "raise for one hubel" or, for more complex ideas, to "raise for more than one hubel"

(noun) A successful type of theft which results in an acceptable, impressive and rewarding payday for the protagonist.