A girl who is giving a blow-job and she's using her teeth or bites down.
Not doin that again shes a clam mouth.
by Psycho-Bitch-4969 November 22, 2014
Get the clam mouth neck gaiter and mug.
Being in a very bad situation
Hey did you study for the test? No, did you? No, oh man were in the clams mouth now!
by Twiisted February 08, 2019
Get a In the clams mouth mug for your mom Beatrix.