qwertytrewq is a certain word used- well I wouldn't exactly call it a word, but it's the kind of thing that you would type to a friend or google search when it's 3: am and you're bored out of your mind and you don't know what else to do.
When you get so bored, you decide to do 2 letters from the left then 2 letters from your right until you run out and you keep going to the bottom of the keyboard until you run out of letters.
Person 1: I'm bored Person 2: Try looking up qwertyuiopasdfghjklzxcvbnm
Person 1: already did
Person 2: try looking up mnbvcxzlkjhgfdsapoiuytrewq
Person 1: already did
Person 2: qpwoeirutyalskdjfhgzmxncbv?
Perosn 1 : yup
Perosn 2: qwertyytrewquioppoiuasadfggfdsahjkllkjhzxcvbnmnbvcxz
Perosn 1: No longer bored