Top Definition
The mark left in one's pants after receiving a very big fright.

Often referred to in a descriptive sentence i.e. "I shat my pants!"

'Boomark' replaces a four word sentence with a single word that says the same thing.
That rollercoaster was so hectic it gave me a boomark!

When my girlfriend remarked that she hadn't had her period, I almost boomark(ed)!
von Miss Syah 12. November 2009
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