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Formerly, a party in which everyone brings their own alcohol, which upon entry is taken and poured into a large vat with the rest of the booze. This concoction is served in cups from a tap at the bottom of the vat, and has become less popular over the years.

More recently, a vat party is when several attendees bring a supply of recreational pills to a party, preferably of several kinds or types, and the pills are all mixed into a bowl where adventurous attendees can investigate potential combinations for a particular effect, or discover their own. Many people die at such parties, especially when mixing the pills with alcohol.
Five people in my family had surgery this past year and I'm gonna host a hell of a vat party with their leftover scripts!
vat party by spider kids March 10, 2011
Related Words
Vat vato Vatican Vatsal vatnik Vato Loco vatican roulette Vatika Vator Vatten

Vat Da Faak 

A more clean way to write "What The Fuck", having the same meaning as WTF
Oh Vat Da Faak?

vat o'sop ding 

a COMPOUND definition! requiring SOME imagination! :

'vat' a reference to to the larger sizes (ie: 'drum' or 'tub' ) of soft drink sold at the fast fooderies (ie: ultra gulp, e.t.c.)
and "SOP DING" , once heard stated by an asian guy new to english at a "sam and allen" (7-11) one night when my friends and i were in there while orbiting jupiter (EXTREMELY high !!)

the guy said: "no surpee onhwe SOP DING" ! we three looked at each other blankly, going HUH??; for some time!
finally, we figured it out! OH!, SOFT DRINK! fifty years later, we STILL say "sop ding" !

it was a "mental tattoo" / unforgettable moment !
i'm going down to the sam and allen to get me a vat o'sop ding
a vat o'sop ding will make you SLOPPY FAT !!
pull over sam! , ah need me a vat o'sop ding !!
vat o'sop ding was unappreciated the urban dicks! , i didn't take it personally !
vat o'sop ding by michael foolsley September 2, 2022

VAT free 

VAT free by anx June 5, 2003
Someone who is a boz. Someone who can eat my klir. Someone who has no inqnasirutyun. If you ate a qfur, xlesh if you are a cchox, choqox or etc., you are a vat txa and can eat my jujulik.
Person One (lav axper): Mech axper today at school I made new friend, his name is flan fstan.

Person Two (mech apxer): You not good ay txa. Dont talk to him again hes a vat txa.
vat txa by Lav Txa Gevorik February 2, 2023

VAT free 

You wont get pregnant baby, I'm VAT free!
VAT free by Minges and all! April 15, 2003