while shaking someone's hand, proceeding to stick your thumb in your butt and yell out in a German accent "Thummin Mine Asshole"
Example:

Friend 1: I met my girlfriend's parents yesterday

friend 2: how did that go?

friend 1: good. we did a vietnamese handshake.

friend 2: what's that?

Friend 1: we all stuck our thumbs in our asses when we shook hands and yelled out "thummin mine asshole" in a German accent.

There is nothing quite like sticking your thumb in your ass while shaking somebody's hand.
by shiteater9000 April 14, 2010

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