听到有人说I have a sweet tooth，你会怎么理解？其实，这个表达在英语里使用已经有几百年的历史了，意思是“我喜欢吃甜食”。那么，如果有人说I have a meat tooth的时候，你就不会不明白了吧？

Meat tooth refers to someone’s craving or fondness for meat. This term is a rhyming play on the well-known phrase sweet tooth, a craving or fondness for sweet food, which has been in the language for over 600 years.
Meat tooth指某人爱吃肉。这个说法沿袭了sweet tooth押韵规律，并进一步演绎。Sweet tooth在英语中流传使用已超过600年，是人尽皆知的一个短语，用以形容对甜食的喜爱。
For example:

Others craved chocolate or cheesecake; I had a "meat tooth."
别人都钟情于巧克力或奶酪蛋糕，我就爱吃肉。