noun. In the flash animated series of Homestar Runner cartoons, a non-existant wonder that Strong Bad uses by looking into a paper bag. Homestar Runner has hopes that he will someday be allowed to see the Thing In A Bag, and does errands for Strong Bad to curry his favor.
HS: What are you doing?

SB: Hanging out at The Stick, looking at a thing in a bag.

HS: Can I see?

SB: No. It's for me. And The Cheat. And Strong Mad.
by Marc February 25, 2004
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Its freakin awesome! You usually hang out by the stick looking at it while drinking drinks (preferably 2 reds, a blue, and an orange) and hanging out with some cool guys. But be careful, it may escape into the mountains.
What about the thing in the bag?... I mean... I think im a cool guy...
by Anonymous June 22, 2003
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1. This is something you do when you want someone wholly retarded and gullible to get drinks for you because you're too lazy to do it for yourself.

2. Something one aspires to be doing if they just wanna be a cool guy.
by Sasori May 12, 2003
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