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Phrase Meanings » crap up
What does "crap up" mean?
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Burden or clutter up, as in Jane crapped up the garden with plastic pink flamingos. [c. 1946]
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Ruin or foul up, as in I've really crapped up this speech; can I just start over again? This idiom employs crap in the sense of “defecate.” [Vulgar slang; c. 1950]