A guy from San Francisco's definitions

Matsumoto

a noun that describes a weird person with a creepy smile. Originated from Mr. Paul Matsumoto, a chemistry teacher who smiles every time when he tortures his students.

Student A: Mats, how are we supposed to know this?
Matsumoto: You learnt this before. Now you gotta integrate. Isn't this fun? (creepy smile... ;D)
Student A: uhh...

by A guy from San Francisco April 9, 2013