The facial expression of a person after having his face covered in hot semen.
After being the receiving member of a bukkake circle, Mike showed his Dirky grin.
When women who get botox injections in their lips and end up with enflamed/swollen lips
When a grin (or any other object) is perfectly symmetrical. Yeah man.
Racecar grin and a bottle of gin.
A large, toothy smile one has while under the influence of LSD, that will not go away.
I've got the Electric Grin, I just can't turn it off!
To do something for the sake of Just doing it, and having no real purpose or goal other than just a good time.
"You wana Suck eachothers cocks for shitts and grins?"
Man's smile when he has a near constant erection.
I can' wait to be with you again. I have a Cheshire grin that won't go away!
When you wakeup in the morning with an awful hangover (thickhead) but then you realize how much fun you had (grin).
Al woke up with a terrible headache after his 40th birthday party by then remembered how much fun he had. He was experiencing a thickhead grin.