Am I Bi? That's None Of Your Bismuth - Excuse you but my sexuality is none of your bismuth. Get it? Bi? Bismuth, the pentavalent post-transition metal? Bismuth's abbreviation on the periodic table??? It's a joke about my sexuality being none of your business using science jokes! This funny science joke shirt is great to wear.... periodically. Get in your element and possibly get a laugh from scientists, chemists, nerds, the lgbt community or anyone else who enjoys a good pun.