A Trumpie is a Trump Supporter who "exceeds expectations" I guess. They tend to be from 16 to 60 years old and have a Trump 2020 or Make America Great Again hat. They tend to be racist and homophobic, they can also be sexist.
"Bro, I had the worst fight with a Trumpie at school today, no cap"
"Ugh, I get you, man, my sister's boyfriend is one of them."