A kez is something a women does such as stringing on a man for a long time and making the man fall in love with her whilst she is with another man but when the first man asks if she is with the secound man she will deny but she really is. Or just a women who said she likes a man but then doesnt give herself to him.
'Look love dont do a kez on me'
'That girl done a kez on me man'
'Leave that girl, shes being a kez'
'Leave her shes doing a kez'