from the English 'Bad Joke'. Most commonly describing a female of breathtaking good looks. So stunning that it is a 'joke'. it is also used to describe a type of perferction, as well as a large and well formed bottom.
When your sick and your voice is crackled and it sounds like your a guy going through puberty.
P1: So what are you duin tonight?
P1: What are you duin?
P1: What are you up to?
P1: DAMN! I voice sounds like sick puberty voice!
Mum: Honey, dinner!
P1: Just a second