Someone (most commonly an idiot) that is so blatantly ignorant to reality that they believe every lie that comes out of the president's mouth as to be truth! So bad you think they fell off a wall and cracked their head open!
Mike - yo man look at that trumpty Dumpty!
Steve- why'd you call him that?
Mike- cuz he believes everything that lying President says , what an idiot!
Steve- that's funny cuz he looks like he's been dropped on his head hahaha!
The phrase referred to Donald is specific and in general, someone who's too conceited to see he/she is/will be the cause of his/her own downfall.
Humpty Trumpty Dumpty's unaware rotten do smell.
Meeting with Russia officials, he gave classified intel.
Trumpty said he can share classifiedinformation.
Trumpty’s clueless he’s tearing down our nation.