Gruntspeak means: A collective term for the specialized slang, jargon, and informal language used by infantry soldiers - the 'grunts' of the military. Gruntspeak is a rich and constantly evolving dialect shaped by. It is a dialectal or regional word and rarely appears in mainstream teen culture; usage usually points to a family, regional, or literary source rather than peer slang. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour.