`1234567890-=qwertyuiop\asdfghjkl;'zxcvbnm,./, is the art of running ones finger along all of the character keys on a standard QWERTY keyboard, by reason of boredom, curiosity, etc.
"Dude, What are you doing?"
"Oh, I'm just `1234567890-=qwertyuiop\asdfghjkl;'zxcvbnm,./-ing around."
When you type this, it means, you are bored, bored, bored and.....b o r e d. You are either doing homework or you are in your classes.
1234567890qwertyuiop\asdfghjkl;'zxcvbnm,./ also means you have run out of options like- qwertyuiopafgjklzcvbnm, poiuytrewqlkjhgfdsamnbvcxz, qpwoeirutyalskjdfhgmznxcbv, etc.