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1.
The 67 year old Vietnam veteran who beat the shit out of a young man who was trying to cause trouble in an AC transit bus. Also known as epic beard man, or more formally by his real name Thomas Bruso
"When Viet Nam Tom's around, just shut your mouth, ride the bus and don't be a clown"
by skizai March 02, 2010
 
2.
The act of old(er) man putting a beat down on punk.
Can be used as an adjective or a noun.

Mike: did you see the janitor beat up the new kid?

John: yeah man, he Vietnam Tomed him.
by ThingsMyManSez January 01, 2011