A friend who is with you through thick and thin. "Down" refers to the act of being there matter what. "Homie" is short for another slang, "Homeboy."
by shaguru October 24, 2011
Like a homie but from Canada's Atlantic provinces, which is referred to as Down Home when people are elsewhere.
by buffycee August 16, 2012
Homie-down.
by Hakuya August 08, 2014