(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.
A popular move in the sport of table football or foosball, whereby the attacking pegs attempt not merely to block the opposing goalkeeper's clearance but to strike it on the volley straight back into the net.
Also known as the 'slapback', this tactic was believed to have originated in Hong Kong.
Red Player: I'm totally going to strike this full pitch and score with my goalkeeper.
* Kwok *
Blue Player: Nice try douchebag, you got kwokked.
OR
Henry was never too skilled at foosball, but when his front trio started jittering, you knew the kwok was about to strike one.