The least interesting man in the world. It is dos equis spelled backwards and dos equis is famous for their "most interesting man in the world" commercials so therefore it spelled backwards is the least interesting man in the world.
Pronounced sod seck-ee
Student 1-Omg, my english teacher is the most boring person in the world. He spent the whole class telling us about his travels to Nebraska!
Student 2-Wow, he sounds like a real sod siuqe.