Top Definition
When something awesome happens that you need to make up a word for it.
Sharon: "Dude! That was awesome!"
Kim: "No, not just awesome. That was shmashum."
Sharon: "Yes, it even rhymes with awesome."
Kim: "Shmashum awesome, that's pretty awesome."
Sharon: "No, man. Shmashum"
by WecanlivelikeJackandSally June 19, 2010

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