From Longman Dictionary of Contemporary Englishgabgab /ɡæb/ verb (gabbed, gabbing) [intransitive + about] informal TALK TO somebodyto talk continuously, usually about things that are not important You two were gabbing so much you didn’t even see me! —gabby adjective → the gift of the gab at gift1(5)→ See Verb table
Examples from the Corpus
gab• The night before the trip, we sisters stayed up late packing and gabbing.• They spend way too much time gabbing when they should be working.From Longman Business DictionaryGABGABFINANCE written abbreviation for GENERAL ARRANGEMENTS TO BORROWOrigin gab (1700-1800) Probably from gabble 