Shota Aizawa, also known as Eraser Head, is the homeroom teacher of Class 1-A in My Hero Academia, known for his tired appearance and blunt way of speaking. Clips of his voice are widely reused by anime fans because that serious teacher energy contrasts well with everyday internet language. This abbreviation explanation fits that pattern, turning shortened online terms into a moment that feels like a formal lesson. It has spread through soundboards and short edits where fans use familiar anime voices to react to slang, chats, and fandom jokes.