The story
Introduced in "Kung Fu Kapers", a 1975 episode of the British comedy television series The Goodies. In the episode, "ecky thump" is a secret Lancastrian martial art using black puddings as a weapon.
Etymology from Wiktionary, CC BY-SA 4.0.
ecky thump
Today it means: Exclamation of surprise or pleasure, supposedly part of a Northern English dialect. Full definition →