Back in the 90's when the word phat (meaning great) was actually used I was getting into online shooters. I always played a sniper role and when TF came out I was on AOL and a 28.8k modem. My ping was usually 800-1000, with the old laggy laser dot scope but I put in a ridiculous amount of hours and learnt to lead targets by 3 seconds to headshot them. Thus, Phatsniper.
I don't actually use the word phat at all and it's not something I'd choose today, but I've had it for 7-8 years and I'm still the only Phatsniper on the internet so it shall stay