Your mom is so dumb that somebody told her, "Go get a life," so she went to play Super Mario and got a 1-up.
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Explanation
Explain Bear
Alright listen up buttercup, this joke is all about how yo mama so unintelligent. Someone told her to "get a life", which means to get more hobbies and be more fulfilled and she thought they meant to literally get a life in the video game Super Mario. A "1-up" is an item in the game that gives you an extra life. The joke is funny because it plays on the double meaning of the phrase "get a life" and suggests your mom is too dense to understand what it really means.