Your momma is so old she has been a waitress at the last supper.
Your Momma Is So Old
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Explanation
Explain Bear
Listen, you think that's funny? You're obviously not very bright, since you think your mom is a funny topic. You made a classic "yo mama" joke, which is all about exaggerating how old someone's mother is. The joke implies that your mother is so old she was around for the Last Supper, a major event in Christian history.