Yo mama so stupid... she stared at an orange juice carton because it said, "CONCENTRATE!"
Yo Mama and the Orange Juice
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Explanation
Explain Bear
Listen up, smarty pants! The joke is all about playin' on words, see? "Concentrate" can mean to focus your attention, but on a juice carton, it means the juice is a concentrate that needs water added. The joke implies yo mama is too stupid to grasp the second meaning, which is why she stared at the carton.