A person who took to crime, gangs, drugs, and/or violence, to find exceptance and truth, had a hopeless past and future but found the Lord Jesus, in christian terms,(got saved), and God changed them, forgave them of their past, took their guilt and made them new, then used their experiences, gained through living this way, to help those still trapped, to be free, and find what it is that is missing in their lives, in God.
(Life application bible)
"Through you i am saying to the prisoners of darkness, 'Come out!. I am giving you your freedom!'.
"Through you Laura i am saying to the prisoners of darkness, 'Come out. I(the Lord your God)am giving you your freedom".
A Gangsta4Christ is someone who has, and will endure anything to bring light into the darkness, and bring christ(to)lost.