Literary Genius- Author of the awesome Harry Potter series
A very pretty woman as well.
Thomas: hey john, JK Rowling is doing a book signing at the Barnes and noble over on main street, want to come?
John: definitely! what time do you want to go
Thomas: as soon as possible, maybe 1 or 2
Used in place of "jk", to denote any previous comment as having been in jest.
Also can be used in conjunction with other harry potter references, where appropriate, as in:
Person A: I thought you were jk rowling!
Person B: No, I was totally being sirius black, I meant what I said!
Person A: Well fuck you... Professor... Sprout!
Person B: lolwut?
(JK rowling and sirius black are the only ones that really work together)