A word used to describe a chin with random hairs on it, or a chin with unkempt stubble that is shit to look at. Chun can also be used as an insult when describing someone.
'i'm so glad I didn't have to kiss grandma jones goodnight, she's boasting a right rabid chun!' 'why is everyone looking at me like I'm mental?' 'because you're acting like a complete chun, that's why...'