"heyyyyyy, soooo sorry, got stuck in a meeting. Be there in five."
Personally, I'm a huge fan/offender of using extra letters to convey emotions via text or email -- stress, angst, happiness, excitement when a friend signs into g-chat, etc. But overuse of "Y"aside, the ease of being constantly connected to our friends makes this tardy text all too familiar. We've all come down with T.E.D., Time Estimation Disorder. (teddddddd)
In a nutshell, as this very true to life article explains, thanks to technology and the ability to document our lateness every step of the way, we're all a lot more casual about keeping people waiting. Well, except yours truly. No matter how hard I try, I am always on time. It's so uncool.
PS: The extra letters tactic is not good for work. For example: "Hiiiiii, let's meet at 4 for my review." Write like a 4th grader and you can kiss that raise goodbye, sister.