Someone who has a dick where their heart should be. This condition causes one to be mean, inconsiderate, jackassy and unable to empathize with other humans. Currently, no know cure for dickheartedness exists. People with this condition will always be dickhearted assholes no matter what.
Of course Donald Trump hates Mexicans, he's Dickhearted. He has a dick where his heart should be.
noun
VULGAR SLANG
a stupid, irritating, or ridiculous man, with visions of grandeur such that he thinks he is a ruler with total power over a country, occasionally one who has obtained control by force, but more often just through smoke, mirrors and utter bullshit.
"When somebody is president of the United States, your authority is total," - Donald J. Trump, April 13th, 2020.
"You're a fucking dickheadtator, buddy!" - Rest of the human species, soon thereafter.