From ThinkGeek:

“Imagine the possibilities! Visiting in-laws? We recommend, “im in ur offspring sproutin’ ur family tree.” Stuck at the office? May we suggest, “im in ur meeting eatin’ ur donuts.” Out for some wardriving? How about “im in ur unsecured network downloadin’ ur pr0n.” Techs could proudly wear their own “im in ur computer upgradin’ ur RAM” shirts. Or for a more recursive bent, how about “im in ur lolbots crashin’ ur server”?

Better yet, don’t imagine. Experience it for yourself with our unique black 100% cotton t-shirt which comes pre-packaged with its own write-on, wash-off marker. Black shirt with white lowercase text and fill-in-the-blank style boxes for ur fillin-in-the-blank pleasure.”

$16.99-18.99