GAB Meaning of GAB in English I . n. ( Colloq. )1.Mouth.2.Prate, prattle, ~ble, idle talk. See prate , n . II . v. n. ( Colloq. ) Chatter, prate. See ~ble , v. n . Soule. Dictionary of English synonyms. Словарь английских синонимов. 2012