Stupid and pointless with no purpose except pissing off Californians. Might as well call Arizona as Arizo, Virginia as Virgi, Oregon as Oreg, or maybe Vermont as Verm.
"Cali" is an unecessary shortened term used by the most pretentious of human existences that have chronic back pain from implants, cocaine on their lips, and cannot find Canada on a map.
"Cali" does not make one sound cool in the slightest.
Person A: "Dude. let's go to Cali and surf brah"
Californian: Kicks Person A in the crotch