1. A person that is so chachy that the connotations of the term cannot encompass their chachiness.
2. Someone who is both a douche and a chach.
3. The most annoying kind of person there is.
4. Ryan Tedder, the lead singer of the band OneRepublic.
"I can't fucking stand that guy, he's such a douchechach!"
"Did you just hear that? Only a douchechach could write such a terrible song."