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Mashing irrelevant, randomly-selected, or just plain ridiculous analogies into a metaphor that simply doesn't work, in a lazy attempt to sound creative, irreverent or funny.

From the phrase "Forced Metaphor"
I have marked down your term paper because the following phrases are clearly metaforced: "The evening was pregnant with merriment" and "Her eyes were sparkling turds"
by Selwyn Nogood November 28, 2010