Your mom

Your mom is a slang term for a prostitute or slut. This insult is only used by retards who think they are the king of comedy. But they are only the king of not getting laid

I banged your mom

Your nan

Your Nan is a comeback which is not just worse than your mom but more annoying. It is only used by people who were dropped when they were babies as a cheep comeback because they are more brain dead than a hedgehog on a motorway full of fast moving lorries.

Your Nan is in my bead.