Definitions by gheeky

SLACC 

Smiling like a Cheshire Cat. Grinning from ear to ear in the style of the Cheshire Cat. Used to denote a monstrous smile that is completely involuntary and impossible to conceal due to the sheer level of joy imparted by the grin inducing action.

He told her she was awesome and she just SLACC.

SLACC by gheeky July 17, 2014