Mr. Yang
Common slang for having a really cool or good teacher. Originated in Bronx HS of Science before spreading all over nyc public schools. Named after Bronx Science teacher, Mr. Yang
"You're so lucky, that teacher is such a Mr. Yang!"
"Damn, my teacher sucks! I wish I had a Mr. Yang."
"Damn, my teacher sucks! I wish I had a Mr. Yang."