This is just another term for a good friend in birmingham street slang.

a blood clot manz who is ghetto

when your friend is being a dick head embarrassing or said summit dumb in front of your other friends this can be said

On the 18th of July is the day where you appreciate all your friends ‘bredrin’

(Jamaican Patois, MLE, n.) A word to refer to one's friends. Also can refer to relatives in some cases. Comes from the English word "brethren", a word for one's relatives.

Close friend its basically a slang word to describe your close or just normal friend's