kwok

(verb) - to deny access to a resource (usually a toilet) by occupying it or otherwise rendering it unusable (often for extraordinarily long periods time).
also kwokked (adj) - broken, unusable

Rough night last night, really had to take a shit. Tried to go the bathroom three times over half an hour but was kwokked each time.

or

Sorry, I can't get that information right now, the database is kwokked.

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