Rolling on iFloor Laughing
Derived from iLol, a joke used mainly by Microsoft employees to mock the way that Apple adds an 'i' to the start of things to make it theirs.
Add multiple 'i's for emphasis, e.g. Roiiiiiiiiiiiiifl!
Andrew: Hey Jon did you see Megans new Facebook status?
Jon: No, wait. Oh Yea! iLol
Andrew: And that video she posted,
Jon: Yeah I saw that, Roifl!