What Bill Oddie says when a normal person would say 'fuck me rigid' or words to that effect.
Kate Humble: I'm going public about our relationship, Bill. By tomorrow morning the world will know about your propensity for freeform nambling and Belgian biscuit, you sick bastard.

Bill Oddie: Oh, ecky thump.
by Lord Grimcock November 15, 2009
Another phrase used in the same way as ee bah gum to show surprise or curiosity to something
"Ecky Thump, what's going on 'ere?"
by Proper Sheffield lad July 30, 2021