GUMP, an acronym for "Gas", "Undercarriage", "Mixture", and "Propeller". It is a mnemonic to help a pilot to check four critical items in an airplane prior to landing.
GUMP, an acronym for "Graphical User Menu Program", used to present a graphical user interface to a player in Ultima Online.
GUMP is the front-end generator for the Oz programming language which reads Oz source code with embedded scanner/parser definitions and outputs Oz code in which those definitions have been replaced by classes.
GUMP, name of the famous Gavin Meredith of Cefn Mawr Massive.
Gump, an informal greeting and/or way of informing somebody that they have just embarrassed themselves, as used in the Lancaster/Morecambe/Heysham area of the North of England.