Acronym for careless pot smokers. Bring Your Own Bong
"Dude, I broke my piece, when you come over BYOB"
by Tobias Trujillo December 30, 2005
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Bring Your Own BIOS

Back in the earlier years of computers, prior to standardization, manufacturers of expansion cards put the BIOS commands for the device directly on it, stored in ROM.
Eric: Mr. Williams, I can't find a driver disk for this modem!
Mr. Williams: Duh, there isn't one! It's BYOB, the bios is ON it!
by Eric Pheterson December 15, 2004
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Bring your own beer/bottle/booze/beverage

Used when an event or restaurant will not be serving alcohol. Lets patron know that if they'd like to get drunk, they will have to facilitate it themselves.
BBQ at Mike's tomorrow. Will serve plenty of soda but BYOB.
by Jamesch April 6, 2010
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1. A term used by many people that can stand for various things including:
Bring Your Own Beer
Bring Your Own Boobs
Bring Your Own Booze
Bring Your Own Bacon
Bring Your Own Bitches
2. A kick-ass song by System Of A Down off their third studio album titled Mezmerize that, like the majority of their songs, deals with politics.
1. BYOB- Bring Your Own Beer

2. I love the song B.Y.O.B. by System Of A Down, it's awesome.
by Thebestoriginalusernameever666 October 15, 2012
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BYOB - Bash Your Own Bible

Commonly shouted at christian preachers who acost teenagers in my town (swindon)
Preacher - "Have your read the prayer?"
Teenager 1 - "Errr no" *looks around for help*
Teenager 2 "BYOB!!"
by Viveash_girl May 11, 2009
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Slang evolving from pubescent gum chewing parties. It's an acronym for "Bring Your Own Bazooka". (Bazooka is a popular brand of chewing gum)
Kid 1: "You comin' to my chew party tomorrow?"
Kid 2: "For sure...what kind you got?"
Kid 1: "Screw that...it's B.Y.O.B."
by DaBunny June 3, 2005
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