One time my mom was like what are you listening to and I was like"elton john"and she was like "relly I didnt think you liked that kind of music" and I was like"featuring Tupac bitch JEA JEA" ---gunitthuggin
Lets say I'm a 12 year old skier who is very pumped on freeskiing that I am obviously driven to make 14 thousand threads in my first few weeks about things like "How do I make a summer rail?" and "Who is better skiers or snowboarders?" or "Stowebum is gay" and all the sudden nobody likes me anymore. I might be compelled to hide my identity and make a new NS username. The new NS username would be an alias.
Or, lets consider a second scenario. Let's say I am drunk on a Friday night and for some reason have nothing better to do than sit at my computer. So I think it would be funny to create a fake username and pretend that I am Mexican, a black freestyle rapper, or a spellchecking program. Also aliases.