If one wants to call themselves or others "bipolar" as an adjective, shouldn't they somehow add the state of stable to the mix? I am "of the three type mood" kind of person. One is not only bipolar as in depressed and manic. Are you never ever ever stable? If not, then saying "I am bipolar" may work out fine if you are never stable. Saying "I have bipolar disorder" clearly states that you have a specific kind of disorder.

I have nothing against using the word "bipolar" as an adjective, but not as a description of a person. If you want to use "bipolar" to describe moods, fine. Tendencies, fine.