This word has universal meanings, but is most often used as a verb. It could mean anything from puking, to fucking up, to having sexual interactions, and so on. The term usually refers to one with a particularly special personality. Not everyone can be a rork, but many can pull a rork.
Rorke's Drift was a mission station on the Buffalo River that was defended by the men of B Coy, 2-24 Regiment of Foot from thousands of Zulu warriors on the 22nd-23rd of January, 1879.
Guy: Hey did you hear about Rorke's Drift?
Guy 2: Yeah, where those Brits kicked the Zulu's arses!
to laugh unexpectedly loud, at something that wasn't meant to be funny, but is. the laugh is sudden, and hard, and quick, and sounds like something between a roar and a squawk, hence RORKE.