2k5 = 2005
2k6 = 2006
2k7 = 2007
Bush is NOT leaving the office in 2k8. He leaves Jan 20, 2k9.
Certain forums on the internet use "2k..." to describe other users. For instance if a new member makes a stupid remark, he may be called a 2k7er or soon 2k8er. It just means that they have been a member of the forum for that long. Having been with a forum long gives a person more respect on the forum.
James: In 2k8
pballer12345: Man the ion is the best gun on the planet. (user joined forum Jan 2008)
pb4life12345: STFU stupid 2k8er
John: When will Bush be leaving office?
Joe: Jan 20, 2k9