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."
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.