grin from hell

huge smile that simply will not go away, despite obvious facial muscle fatigue.

You've just spent all day in a Porsche, at the racetrack, with a professional driver coaching you around. It's 11PM now, you're in the hotel room, unable to sleep because your jaw hurts so much from the grin from hell you're stuck with now.

by runnamukk June 29, 2011

grinning face with sweat

Means unable to control feeling under very } conditions (almost every adjectives can fit).

Hahaha, i love how people just dodge at the last second of champ select in League!!!(grinning face with sweat)

by Chara0420 September 20, 2021