giving baseless biased opinions playing them as facts, making decisions with no research or forethought, being a general douchebag. these could all be reasons for "trumping" or "being a trump"
Trumping (adv.)- (1) a form of self-pimping for the purpose of placing yourself in a position to do actual harm to the free world; (2) saying or doing something at the expense of one's own credibility for the purpose of grabbing headlines.