When your girlfriend acts like a single girl on snapchat, Instagram, vine, etc.
"Darn... Jennifer is acting so social media single right now."
You are single to everyone else except your partner. If you still have all of the elements of a serious relationship, physical and emotional and both partners know. If the relationship isn't socially exeptable or forbidden but the partners keep it secret, but still act the same.
" You cannot date him!!! " she still does. Means socially single.
Socially single is when you are single to everyone else except your partner. When a relationship isn't socially acceptable or bidden by others ( including or especially parents ) consent from both partners. Socially single is just like dating but no one know except you and your partner. It is not friends with benefits or fuck buddys . It still has all the qualities as a serious relationship.
Things prevent me from dating Colton but we still secretly do. I'm socially single.