The term SNS generally refers to a Social Networking System or the platform that it is served on (Social Networking Software).

Screenshot N Send. Commonly used when someone DM’s a meme from a private Instagram account. The receiver will reply “sns” to let the sender know they don’t follow that account and need to be sent a screenshot of the meme.

Saturday Night Special, particularly good pictures posted on AwkwardFamilyPhotos.com on saturday nights.

Stiff Nipple Syndrome

An abbreviation for "shit and shower." The act of defecating prior to a shower, usually in preparation for something one would like to be relaxed for.