A dotche is a person or thing that is so retarded or ugly that you cant help but to laugh when you look at them/it, but deep down inside u feel sorry for them but you continue to laugh because its that hilarious!
Dotche can be used to describe anything thats stupid, lame, or just un-cool.
Ryan: hey man did u see David at school today?
Kellan: no dude what happened?
Ryan: he just looked like a straight homo!
Kellan: hahaha what dotche!