When your girl is sucking your dick and you pull out and very violently you hit her in the side of the cheek with your dick until it begins to hurt you or she pulls away.
Dam after that loose jaw i gave cindy last night her cheek is bruised and she cant speak.
by E.K August 07, 2006
Get a loose jaw mug for your friend Riley.
When you tell a bird a secret and they run and tell everybody
Girl: I told my man that my sister is an escort and he ran and told his boys. On god he has loose jaw syndrome.
by kmxo February 19, 2019
Get a Loose jaw syndrome mug for your mother-in-law Zora.