Stamp

[Sarah]

A picture cut in wood or metal, or made by impression; a cut; aplate. [Obs.]At Venice they put out very curious stamps of the several edificeswhich are most famous for their beauty and magnificence. Addison.

[Sarah]

stamp=ok/ thats koo/thats str8/thats a bet! in dc slang
usually used when excited about finding out something
almost the same as bet

[Sarah]

To confirm an idea or plan aggressively, loudly, and/or abruptly. Such as to stamp a document for approval.

[Zipporah Schumaker]

Bring down (ones foot) heavily on the ground or on something on the ground.