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