to hold or express (an opinion); think; suppose: now usually said, with satirical or judgmental force, of a speaker regarded as pedantic, pompous, etc.
See opine in American Heritage Dictionary 4
(ō-pīnˈ)
verbo·pined, o·pin·ing, o·pines verb, transitive
To state as an opinion.
verb, intransitive
To express an opinion: opined on the defendant's testimony.