"contorted mouth" is a correct and usable phrase in written English.
It describes a mouth that is twisted or distorted in some way, often due to strong emotions or physical strain. Example: As she struggled to hold back her tears, her contorted mouth betrayed the pain she was feeling.
His face was contorted, mouth open.
He gave her staring eyes and a contorted mouth, apparently painted from his own reflection in a circular mirror.
It's a beautiful thing to see spittle form at the corner of a meanie's contorted mouth while you just smile sweetly, innocently, in the immediate aftermath of an insult.
That and he has cataracts, is just this side of deaf, leans to one side, slurs his speech (it's that contorted mouth), has a pacemaker and the shakes.
A squadron of seagulls excitedly hovered as Shirley pressed a button and the bed tilted backward, sending a putrid tangle of legs and contorted mouths thumping to the ground.
Imagine a bald Jimmy Savile painted aquamarine, contorting his mouth into a gaping downturned maw.
As director Geordie Brookman has her lean out of the light and into shadows, her face seems to contort: her mouth tunnels backwards in ghoulish proportions, her eyes disappear into deep holes.
Watch her contort her mouth as she morphs into Patti LuPone or widen her eyes as she channels Carol Channing, and it is clear that what Ms. Pedi makes look easy is difficult and rare.
When sampling the delicious Baskin Robbins ice cream as a dessert, the spoon size requires me to contort my mouth into odd positions to get the dang thing to fit — and every so often the spoon will have sharp edges that slice the inside of my cheek.
Learn to walk the odd way he does and make a habit of licking your lips and contorting your mouth like he does.
Invited to talk about her husband, Mrs Sidney becomes distressed: "the scarlet line of lipstick above her top lip contorted independently of the mouth".
