When a sultry, lesbian woman locks in eye contact with you - her hapless victim - and aggressively flicks a limb in the air exposing her throbbing honey patch, thereby making a U-shaped opening similar to a wrench.
That feeling you get when you put your toothbrush too far into the back of your mouth when you're on the very edge of vomiting where it seems as though someone is torquing your stomach with a wrench, and you manage to hold back the contents of your last meal.