Do you want to help Lee?

The other day Lee and I were chatting. For the life of me I can't remember about what. At one point in the conversation, Lee, in a surprise move, says "kiss my butt." To which I reply, "which hemisphere?" Then, there was a long pause and Lee, with a perplexed look on his face, looks at me and says, "There really is no comeback for that."

So, I ask you gentle readers*, do any of you have a good comeback?

*Small and large-butted people are invited to respond.