a nickname of justin bieber for looking musty and not taking a shower (seen under popcrave and popbase replies often)

when you've done something so cringe you can't stop replaying it in your head and it stops you from getting on with your every day life

a nickname for justin bieber for looking moldy and not taking a shower, as well as being a misogynist, racist and disgusting man

One of the most musty looking artists in the music industry who makes trashy music like "yummy"
He did got better by using unnatural products, recommended by his wifey

jokingly justin, frequently used under popbase’s replies

A child between two people who had a one night stand.

Mustin is used when Justin Bieber looks ”musty”. But its important to add that he looks ”musty” because of his lyme disease. It affected his skin with acne and his mental health so that he did have the energy to take care of himself (like showering and eating properly). So using the term Mustin is mocking him with his disease.