DDog does it; looks at me after I tell him "Leave it!" when he bugs me for some reason and and gives a tiny bark with his front teeth exposed. I ignore him and he leaves me alone. It reminds me of the eye roll from my kids as teenagers.
Deja, GSD, sable WL, female, born 11 / 2013
Cam, Rough Collie, sable, male, born 8/2015