Top Definition
Your 10,000th day alive. You'll reach your Tkday when you're about 27 years, 3 months and 15 days.

It's a big day. You've finally moved from being a four figure day person to a five figure day person and you'll always now be a five figure day person.

On you're Tkday you actually become an adult. Forget 16th, 18th or 21st birthdays - you don't actually know anything then. But on your Tkday you should really have worked out that life's a bit tricky and things aren't going to work out exactly as you'd hoped but that you do have a couple of good friends.
"Happy Tkday Mark"
"Thanks Stu"
"How does it feel"
"Fine, actually"
by V.G.Farmer October 25, 2006
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