Warning: Contains SPOILERS for The Incredible Hulk #15! The Hulks catchphrase, Hulk Smash, is about as iconic as he is, as he says it in practically every adaptation (animated or live-action), as well as at least once per Marvel Comics story arc. The catchphrase is so intrinsic to the Hulks identity that even the most casual fan is well aware of it. However, even the most hardcore fan may not know where it originated, as it was just revealed that the Hulks catchphrase is actually 3600 years old, and belonged to an entirely different Hulk.
https://screenrant.com/origin-of-hulk-smash-catchphrase-marvel-comics-revealed/