A person whose thinking is so ignorant that it is worth nothing but the puffs of hot air coming out of his/her mouth; a person who utters an exceptionally misinformed or uninformed opinion.
Denny was always going on about his knowledge of nuclear physics, even though he failed high school Physics. He is such a puff brain!
A supporter of US President Donald J. Trump despite Trump's attempts to circumvent democratically-determined laws and regulations in order to get reelected. A STrumpette lacks a moral compass and is interested only in getting his/her own way without regard for the democratic process.
Kudzu Sploogebrain was willing to trash mail-in ballots in order to keep likely Democratic votes from being counted. He is such a STrumpette.