Yo mama so poor she eats cereal with a fork to save milk.
Yo Mama Eats Cereal With a Fork
Explanation
Explain Bear
Listen here, chucklehead. The joke is about how poor "yo mama" is. She's so broke, she can't even afford to waste milk, so she uses a fork to eat cereal. You know, because a fork doesn't scoop up milk like a spoon does. You probably eat cereal with a knife, don't you?