What does your username mean?

[Romezio]

stop using your naked weapon on Gayle...( ͡° ͜ʖ ͡°)

Stop trying to swordfight with Scarron from the familiar of zero

 

[razz143]

Stop trying to swordfight with Scarron from the familiar of zero

Stop trying to use your thousand years of fingering oopsey death...Lol with Jim carrey..XD

 

[Romezio]

Stop trying to use your thousand years of fingering oopsey death...Lol with Jim carrey..XD

Stop trying to make jim carrey make dinosaur noises

 

[razz143]

Stop trying to make jim carrey make dinosaur noises

stop trying to make mikasa suck her own mangoes...XD

 

[Romezio]

stop trying to make mikasa suck her own mangoes...XD

Stop hating on me sucking on Mikasa's mangos

 

[razz143]

Stop hating on me sucking on Mikasa's mangos

stop fooling yourself sucking the mangoes of mikasa's pic..XD

 

[Romezio]

stop fooling yourself sucking the mangoes of mikasa's pic..XD

Stop sucking on beloved Jasmine plants

 

[razz143]

Stop sucking on beloved Jasmine plants

stop sucking on obama's bald head...XD

 

[Romezio]

stop sucking on obama's bald head...XD

Stop sucking on Donald Trumps wig/toupeeXD

 

[razz143]

Stop sucking on Donald Trumps wig/toupeeXD

stop sucking on james deen underwear....XD

 

[Romezio]

stop sucking on james deen underwear....XD

Stop sucking on whats in his underwearXD

 

[razz143]

Stop sucking on whats in his underwearXD

stop sucking whats under his underwear....XD

 

[Romezio]

stop sucking whats under his underwear....XD

Stop wearing his underwear on your head

 

[razz143]

Stop wearing his underwear on your head

stop wearing mikasa's bra on your chest...XD

 

[Romezio]

stop wearing mikasa's bra on your chest...XD

Stop hatingXD

 

[razz143]

Stop hatingXD

stop drooling...XD

 

[Romezio]

stop drooling...XD

Stop peeping on me and MikasaXD

 

[razz143]

Stop peeping on me and MikasaXD

stop leaping on me and mikasa...XD

 

[Romezio]

stop leaping on me and mikasa...XD

Stop using Sasuke body pillowsXD

 

[Airi]

Mine is obvious Lol

Very obvious xD

Well, Kagerou comes from the series Kagerou Project/Kagerou Days (or atleast where I first heard of it from). xD

But in Japanese, Kagerou means mirage (in english), dragonfly, heat-haze or "multitude of dragonflies".

Mirage also comes from my other name, "Kaito", which means mysterious. Mirage and Mysterious go together in certain terms, and since Kaito was already taken, I used Kagerou as an alternative.

I chose it because of how nice it sounds as well.

Very detailed explanation! thank you for the effort!
It's a nice username btw ^^