2 definition by BumcrackTheDog

Top Definition
An inch long crevice found on the derriere, that has escaped the modest covering from trousers.
"Cor, look at her bumcrack, the dirty slapper! You could park a car in that!"
by BumcrackTheDog November 02, 2004

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When one has commited a particuarly heinous act of cleverness, nerdiness or Hermione-ness. Stupid boffin.
"Eurgh, what's that smell? It must be Dexter, he's geeked his pants well and proper this time!"
by BumcrackTheDog November 15, 2004

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