It means Save Our Ship, but it can be used for any way of distress. Many people think that it stands for Save Our Souls but in reality it was created by men that were out stranded at sea, also those who thought it stood for Save Our Souls are a bunch of wankers.
Captain Rick: I put out an SOS so we can be found!

Dickweed Shawn: Awesome everyone will know to Save Our Souls!
Captain Rick: Fuck you *throws Dickweed Shawn overboard*
by Pristinememes69 April 22, 2018
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Originally from Greek sos
Base of word: sozo
Definition
to save, keep safe and sound, to rescue from danger or destruction
one (from injury or peril)
to save a suffering one (from perishing), i.e. one suffering from disease, to make well, heal, restore to health
to preserve one who is in danger of destruction, to save or rescue
to save in the technical biblical sense
negatively 1b
to deliver from the penalties of the Messianic judgment 1b
to save from the evils which obstruct the reception of the Messianic deliverance
The all encompassing sos of God.
by lookingback2history January 18, 2015
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"Sex On the Side." When you cheat while in a committed relationship.
My wife didn't love me enough so I had to call Jenny and get a little SOS.
by BMan100 April 12, 2008
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Someone
Over
Shoulder

To be used when in online discussion and another party (whom you do not want to see anything suspicious being sent from the partner(s) you are having the conversation with)

Useful when the parent walks in and then there is no need for suspicious minimizing on the computer screen.
Tiff: Timmyyy, how you feeling?
Tim: Oh baby, i'm in the mood ;)
---Tiff's father walks in---
Tiff:Wait, SOS
Tim:Ok, so, about the science homework due tomorrow....
by ZeFenomeno June 8, 2009
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SOS is an acronym for "sluts on sunset"

it's commenly used by people in los angeles who populate sunset blvd, or the "sunset strip," a street which is accompanied by many fine women and/or sluts on thursday, friday and saturday nights.
"hey, there's nothing really to do tonight but to go see SOS. maybe we can hit up dublins or argyl while we're at it, or even the body shop"

or you can simply say "im gonna SOS tonight"
by hai2uci September 11, 2004
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