Cheyzilla Share definition Flag To be, or to have been once stupid. Normally used for blondes, rarely for brunettes. Can also be used as a nickname for the name "chey" person 1 dude, did you see that blonde chick!?person 2 yeah, she's a cheyzilla alll the way. Cheyzilla by JustAnAddiction April 15, 2010 Get the Cheyzilla mug.