"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.
" There is a girl at my work that i have been trying to Bredrinate", "At first the girl in my science class did not like me. Now she is trying to bredrinate me"