Hmmm.
This is more what I had in mind:
"Who's Your Daddy?
-- a colloquial phrase that [has recently] gained popularity .... It is a demand on the speaker's part for respect from the addressee, and tends to carry slightly sexual overtones, as it is often employed as a psuedo-Freudian
outburst during sex.
...
-- slang term meaning "I control you", which is often used in prison and by members of the underworld. The expression ... has two sets of connotations: "I am looking after you" or "You are defenseless". The former usage may be derived from the term "sugar daddy", and often has sexually suggestive undertones; the latter usage may allude to parental dominance and authority. Today, the expression "Who's your daddy" is commonly used as an assertion of
domination or sexual control in return for payment or protection."
See
http://www.answers.com/topic/who-s-your-daddy
CJ