When you recieve a blowjob, after ejaculation you slit their throat, then suck the mixture of cum and blood from their throat. This makes for a great protein cocktail. Made popular by american GI's in the Vietnam war with local women.
Guy 1: I am getting that old fashioned feeling...
Guy 2: What? like giving her a Vietnamese Vampire
by Vladamir Lenin January 21, 2011
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A Vietnamese Vampire is when you give oral sex to a menstruating woman and drink the blood.
"Bro did you hear about Jimmy and Susie?"

"Nah what happened?"
"Well I heard that Jimmy Vietnamese Vampired Susie after that party last week."
by $horty Guapo August 18, 2019
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