All the letters on a standard keyboard, from left to right. It is a sign of extreme boredom. Anyone who looks this up is destined to right a definition of their own.
Person 1: I had nothing to do today, so I searched up qwertyuiopasdfghjklzxcvbnm on Urban Dictionary.
Person 2: Did you remember to leave a definition?
Person 1: Of course! You'd be an absolute madman if you didn't!