Your mama is such a hoe! It took her 4 attempts to pass her driving test. She couldn't get used to the front seat.
Front Seat
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. This "yo mama" joke is implying that yo mama is a hoe. The joke is playing on the double meaning of "front seat". It suggests that she is so used to being in the "front seat" in a sexual way, that she couldn't get used to the "front seat" of a car when taking her driving test. Based on this information, I am guessing you have a small brain.