A homonym that sounds like "but her teeth." To call a woman a "butter teeth" is to say her body and face are very attractive but her teeth are disgusting. It is even more fitting if the problem with her teeth is a yellow hue.
"I thought she was so hot, then she smiled- butter teeth!"
noun: usually used in reference to an individual with poor dental hygiene; a result of plaque accumulating on teeth both above and below the gum line that can harden into a rough yellow or brown deposit called tartar. Usually this individual will have a yellow hue to their teeth. This term also causes lifelong torment and guest appearances on Dr. Phil
Hey butter teeth, can I have some butter for my toast?