To fight like an Earper means to fight non-stop and no chill. If person fights like an Earper, it remains polite but fight intensively.
Phrase appeared in taught times of #FightForWynonna movement, when Earpers were is state of constant online fight for their show Wynonna Earp.
A: Those people are very passionate damaging what is their.
B: Yes, they fight like an Earpers