Although Montenegro is a European country, when used as a verb or adjective the definition of the word changes. Montenegro is a filler word pertaining to dominating someone in a task (verb), thus the dominated person is a montenegro (noun). Montenegro can also be used when referring to an individual as being montenegro because they have characteristics of a loser (adjective).
Your bitch ass just got montenegroed (verb).
Don't be such a montenegro, you loser (noun).
Stop killing my vibe with your montenegro attitude (adj).