Frankly, it's not her bismuth.
Mind your own damn bismuth.
A man getting ready for his first date felt a bit out of his element so he phoned his friend, a scientist. To console the guy, the scientist tells him, "Just bismuth. You just might have some chemistry."
"None of your Bismuth".
when coincidentally another geologist passes by. These 'gems' catch his eyes. His curiosity becomes anger and he exclaims,
"I just had a few prized finds of my own go missing a few days ago. Where did you get these!?".
The other geologist replies, "Well, that's none of your Bismuth".