Fast Eddie carries a blackjack which he uses on anybody (without exception) who asks a snoopy question.
Eddie learned to play the piano from his uncle, Dave Costigan, who adopted Eddie after his (Eddie's) POS parents were killed in an L-train accident. (Callahan's Legacy) While living with his Uncle, Eddie began to explore his sexuality. This led to some frank and open discussions which Eddie shared with a friend. This revelation culminated in Uncle Dave's imprisonment and landed Eddie in an orphanage. On his
escape release, he got in a cab and said "Mister, I got a yard [$100USD] and I need pussy more than I need air." The cabbie took him to Lady Sally's House.