Your mom's been giving me attitude lately, so I told her to shut her mouth. When she did, it caused me to lose 4 inches.
Shut Your Mouth
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Explanation
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Explain Bear
Alright, listen up, smoothbrain. The joke is that the dude is talking about his penis. When the mom sucks his pecker, he loses 4 inches, get it? It's kinda like when you lose brain cells every time you open your mouth.