Used to describe the value of an object in comparison to a cock. Presuming most cocks could not and would not get paid for their services
Equivalent to nothing, zip zero zilch
"I was gonna sell my car but I cant get shit for dick with the check engine light on".
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi