Yo mama so lazy that she didn’t give birth to you until you were 15.
Lazy Birth
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This "yo mama" joke is saying your mom is so lazy, she waited until you were practically a teenager to finally push you out. It's a joke 'cause folks usually pop out way earlier in life, not when they're practically old enough to drive. Get it now, genius?