What should I say by way of explanation/apology?

I work in a smallish warehouse, and often in the morning we few guys keep ourselves amused by singing or quoting movies/tv or just making stupid jokes and saying random crap. Among the products we handle are garden plants, including a black cherry tomato plant. This happened to be on my list of things to pull one morning in recent weeks, and I happened to blurt “black cherry” in a voice that was for me more of a soda flavor/movie trailer vocal intention, but could easily have been mistaken for a porno/catcall connotation. Well, one of our suppliers, who happens to be a black female truck driver, whom I’ve only spoken to once and who only delivers once a week, heard me from across the warehouse and apparently registered a reaction. It didn’t really sink in for me until after she left, but now I feel like I should clarify what that was and wasn’t. I hardly know her, so I think it would be clumsy to offer too much—not to mention the fact that my intent had nothing to do with her, or women, or black people—but I also don’t want her to feel like we’re an unfriendly place, because that isn’t true either. Also, I haven’t seen her pass through on her usual day, so it’s been a few weeks. Now what?