A grimace (as explained in a video by You tubers
Weasel Horizon) is the
act of penetrating a females anus with a
dildo (preferably a purple one) with out any lubrication. The act will cause the woman to grimace.
Karin started to fuck Ami in the ass with that purple
dildo during the orgy but forgot the lube.
Jordan: {while snorting molly} DAMN! She givin' that bitch a grimace! SIM
GIRLS!