A word used in place of the word "did" to make the sentence seem redundant and foolish.
Despite "would" being the future tense of the word "will", it's used in place of the past tensed "did", thus making the statement ridiculous.
Joey: Omg guys, I just ate like 40 taquitos.
Shayne: Hah! You would do something like that.
Joey:...
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