by your father

[Dom Tuk]

The slang term By your father pertains to sex. whats the derivating of the word and if it is rhyming slang what does it rhyme with

[Quizmonster]

Are you sure you don't mean "How's your father" rather than "By your father"? The former certainly used to refer to sexual activity, though I've never heard the latter so used. If you do mean 'how', please click
http://www.worldwidewords.org/qa/qa-how1.htm  for an explanation.