I took up the name of Discontented Sheep because I noticed a tendency of mine to jokingly say “bah” whenever something ‘irritated’ me to a small degree.
Yes, I made a noise similar to the bleating of a sheep whenever I was “discontent”.

It was also around this time that I started hanging out/talking to a group of friends that endearingly referred to each other with animal names (e.g. Fish for Farhan, Cow for Mari, Mooser for Bob)

So, fittingly enough, I got the name Sheep. And I responded by bleating.

And so I am the most Discontented Sheep.