When people of Asian descent come in and start crowding or even attempt to take over an area, be it a chat room or a server of an online computer game.
1) Invader - an Irken who has worked up the ranks from Military Grunt to Irken Elite and finally an Invader
2) Zim - A stupid irken who luckially passed the invader exam. Who was banished from thier planet to Food Courtia, after destroying his own planet in Impending Doom 1. He escaped from his punishment and arrived to the Great Consigning, intime to be sent on a 'secret mission' where thier armada is not going.
It's when you're leaving the bar at 2 am and you're driving in a "soccer mom" minivan above the speed limit with cop cars sitting at the corners of every other intersection. You just cruise on by because the driver and passengers that are riding in the minivan are all invanisible.
Driver: Oh crap, I better not speed, there's cops everywhere!
Passenger: Who cares, we're in a van. They can't see us.
Driver: Oh yeah. We are invanisible.