"Bredrin" is the Rastafarian subdialect word for Brethren. With original religious implications, the word later took on the Bible definition of "brother". Hence, one who shares a common ancestry, allegiance, character, or purpose with another.
"Tied not by blood but by heart, we are bredrins for life!"
"Keepin' it vegan mi bredrin!"
your homies such as homeboys and homegirls who you've been through a lot with.. whther negative or positive. in other words, "the realests" of the real.
"Ima be homelate... i'm chilling with my bredjrins all night long, wun."