Guilo (also transliterated to "gweilo" or "gwai lo"; Chinese: 鬼佬) is Cantonese slang for Westerners. In the absence of modifiers, the term generally applies only to European ethnicities and has a history of racially deprecatory use. Cantonese speakers often use the term to refer to Westerners generally, without derogatory context.
*While out with a large group of flushed, sleepy-eyed, stumbling Hong Kongers*
Geoff, the lone white guy, shouts, "GUILO CAN DRINK! GUILO'S GOT THE ENZYME! GUILO CAN HANDLE THAT ALCOHOL!"
Name belonging to a person who's sole purpose is to wreck havoc in video games. Usually standing on top of the bodies of his enemies or drinking the tears of orphans there is no one else as brutal or bad-ass as them.
Man 1: Yo, I had a .12 KDR that game..
Man 2: HA! You suck.
Man 1: I couldn't do anything! There was a Young Guilo destroying us on the other team!