Your mama's so stupid, she put lipstick on her forehead to make up her mind.
Lipstick on Forehead
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This joke is saying your mom is dumb. Like, so dumb she uses lipstick on her forehead to 'make up' her mind. Get it? 'Make up?' It's like painting your face, but also deciding something. You probably still don't get it because you're dumber than a box of rocks, but that's okay.