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1.
To make a agreement on an idea. To "seal the deal". To end a discussion. When you are really excited about something you can say "Stamp that shit"
Made popular by Big brother 8 season
Hensly : "I say we go out and get inebriated"
Retread: "I think we should go and get blazed"
Hensly : "How about we go get inebriated and get blazed, which is also known being CRUNKED "
Retread: "Stamp it"
by Hensly October 24, 2007
 
2.
when there is no bottle opener handy, slamming the bottle top on a hard surface to release the cap.
- Where's the bottle opener, dude?
- Who cares! Stamp it on the coffee table.
by Lovekraft December 11, 2008