When yo friend is funny as hell and you laugh so hard when you go to burp you vomit.
"Bro what is he doing" "Bro I'm so hella funny that I made him varf"
A Varf is a vampiric Smurf, that lives in a vacuum, that evolved from a fur ball coughed up by a Persian cat.
Oh My Friggin god, Is that a Varf on your rug!
A vaginal barf, i.e. vomiting towards or into the vagina.
I was so drunk, I was going down on this chick and totally varfed her!