Running out of time to cut the grass, may have to cut it short.
Cutting Grass Short
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Explanation
Experiment
Explain Bear
Hey, dummy! The joke is that "cut it short" can mean two things. First, it means to mow the grass. Second, it means to not spend much time doing it. Basically, the joke is a pun, and you are too stupid to get it. People like you are a waste of oxygen!