Someone Over (the) Shoulder.

It can be used when your mother is standing right behind you and keeping a watch on what you are doing on the net. Obviously, you cannot tell your girlfriend or whomever that your mom is behind you, so you can just type SOS.
That way your mom won't understand but the person you are talking to can be careful.
Your GF- HEY!
*your mom comes behind and watches the screen*
YOU- SOS
GF- Ok. How are you?
*normal and formal chat follows and your mom ain't suspicious*
*Day Saved*
You can use it against your wife too.
by akky47 October 10, 2010
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When you have no mobile signal and it only shows the red SOS sign
Wylie says: hey valerie, please can I use your mobile phone?

Valerie says: Oh no I would let ya, but I have SOS.
by vky123123 December 8, 2010
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The sexual reference of SOS stands for "Shit on shingles". When you "SOS" someone , you get naked and take a shit on their chest , cover it with country gravy , then eat it.
"Man , this girl is so kinky , she wants me to give her some SOS."

"I know I barely met you, but Im ready for some SOS."
by CougarTom July 31, 2013
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Person One: When I see her it is gonna be SOS!
Person Two: Ooooh you gonna snatch that weave!
by qwertyuioplkijuhytrel February 20, 2014
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Dude i went to a party and saw a chick i wanted to SOS so bad!
by Slinkybean96 June 7, 2011
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1. Stands for "Save our Souls."

2. An overdone joke in the YouTube Poop community where the Poopers use sentence mixing to make said person/character say "sauce," but is commonly written as "sos." It is said that only babies laugh at these jokes.
SOS!!! We're stuck here on this friggin' island! SOS!!!
by sad_boi June 22, 2017
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