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1.
CYS
An acronym meaning Calm Your Shit, used when you have a friend who is just going overboard and needs to CYS or calm their shit.
Person 1: Yo bro you actin mad crazy right about now. CYS dawg
Person 2: Yeah I understand that dawg sorry man
by basedgoddes96 July 19, 2011
 
2.
cys
chill yourself, chill your shit, relax
-yo, im gonna beat you up bitch
-cys dude

by breau April 15, 2008
 
3.
cys
shorthand for "Call Your Sponsor", meant to be a sort of "check yourself" for people with a certain lifestyle.
Jesse: What's goin on people!?
Dylan: cys
by brolioski November 21, 2011