grinnace 

The smile that comes from being happy while in pain

I grinnace every time my boyfriend pinches my nipples.

grinnace by robotbunny March 30, 2015

grinnace 

a smile that ends up looking more like a grimace

At my joke, Sarah grinnaced and I think she was trying to smile, didn't seem like it though

grinnace by Infinity Guitars December 5, 2010

grinnocent 

An emoticon (also denoted in "< >" or "* *") depicting mischievous pseudo-innocence.

Person A: Who stole the cookies from the cookie jar? Was it you?

Person B: Who me? Couldn't be. <grinnocent>

grinnocent by mEna October 13, 2012