Definitions by Net Flights

Grinfreeze 

A medical condition in which the mouth muscles freeze creating a grin like expression on the patient’s face. It is contagious and is believed to be caused by getting ‘a proper good’ deal on Netflights.com.

I think you're suffering from a Grinfreeze mate. Have you been on that Netflights?

Grinfreeze by Net Flights July 30, 2019