This is similar to BYOB or BYOW, except it stands for anything. Bring your own beer, weed, whatever. Mostly used for party flyers and et cetera.
by estherr July 19, 2006
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If friend A wants to share a spitter you say hell no BYOS ! son
by ncity lip packer January 23, 2008
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Australian useage,short for Bring Your Own: unlicensed restaurant where you have to Bring Your Own grog, also similar party or barbecue
by southernsky December 1, 2006
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An amazing song by pianist/vocalist/percussionist/guitarist Regina Spektor. In this case, BYOS is an acronym referring to Bring Your Own Shovel. It is a play on "Bring Your Own Sh*t" in that the song is about receiving an invitation stating to "bring your own shovel and shovel up the mess."
My invitation said bring your own shovel; I brought my own shovel, BYOS.

"I love the song BYOS by Regina Spektor. "
by Penelope Red March 24, 2011
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Bring Your Own Substance(s). Used for party invitations to let guests know they're responsible for supplying their own alcohol, drugs, smokes, etc.

Similar to BYOB but not limited to beer.
by the_Cheshire_Cat February 8, 2011
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Bring Your Own.
Name for a guy who always announces to bring your own but always scabs off others because he couldn't buy from a bottlo because he is such a pinner
Grant: Oi party tonight! BYO!
(At party)
Chris:So grant what did you bring?
Grant:I got denied at the bottlo, can i have a beer?
by LOBSHA~ October 1, 2003
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