A&S - Snapchat slang. It means you're sending a message to both yo

Snapchat slang. It means you're sending a message to both your streak and your story. You're trying to be cool and not get ignored.

I sent a message to my crush on A&S so they wouldn't forget me.

I used A&S and now my story is full of dumb stuff.

A&S is how I keep my streak alive and my story interesting.