It could be about a huge black rooster in a farm. The rooster might be the leader of the flock, always waking everyone up early in the morning with its loud crow. It could be seen as a symbol of discipline and order in the little farm community.
First, if it's just a stupid joke among peers, you can have a conversation with those involved about appropriate language and respect. Tell them it's not okay to use such vulgar terms in relation to your son.
From a story of a huge black cock, say it's a story where the cock is always punctual in its daily routine. We can learn the importance of time management. Just as the cock wakes up at the same time every day, we should also be disciplined with our time to be more productive in our lives.
Well, if not in a vulgar sense, 'huge cock' could potentially be a misnomer or a very strange way of referring to something large. Maybe it's a big rooster on the family farm that the stepmom has some sort of story related to. But this is a very odd and uncommonly used way to phrase it if not being inappropriate.
Well, without more context, it's hard to say exactly. It could be that there is some sort of object or situation that has been misnamed or misrepresented as a 'huge cock'. Maybe your son has a large - sized item that someone is joking about in a very improper way. But we should always be cautious of using such vulgar language when referring to children.
Well, if it's not about something inappropriate, perhaps it could be a story where your date showed extreme confidence, like a 'huge' personality trait that's being described in a rather bold way. For example, they might have been really assertive or had a large presence during the date.