This is the lowercase alphabet that you typed because you were just too lazy to press "caps lock". You also sang the "ABC's" song while typing it and if you didn't, you are officially an adult. You searched it up because you were bored so you went on Urban Dictionary to see what types of definitions you get after typing weird and random things.
The boy was searching up something and a link took him to "urban dictionary", he decided to type "abcdefghijklmnopqrstuvwxyz" in the search bar because he was interested in what type of funny definitions he would get after typing things like this.
by *abcd definition* wise_old_man July 22, 2020