An Erwintard is somebody who is hopelessly in love with Erwin from the anime Attack on Titan. They're usually scrolling through their pinterest feed looking at hot pictures of erwin. If u ever piss one off, then they'll scream "SHINZO WO SASAGEYO" in ur face and then kick u in the balls. The most annoying thing for an Erwintard would be reminding them that Erwin died in season 3.