noun, plural big·mouths /-ˌmaʊðz,-ˌmaʊθs/Show Spelled[-mouthz,-mouths]Show IPAfor 1;(especially collectively) big·mouth, (especially referring to two or more kinds or species) big·mouths for 2.
1.
a loud, talkative person, especially one who lacks discretion.
2.
any of several fishes having an unusually large mouth.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.