Green’s Dictionary of Slang

horse and cart v.

[rhy. sl. = fart v. (1)]

to break wind.

[Aus]R. Aven-Bray Ridgey-Didge Oz Jack Lang 14: Although he wasn’t butcher’s hook he knew that anything heavier [i.e. than soup] might make him horse and cart like a twobob racehorse.
[UK]R. Puxley Cockney Rabbit.
[UK]B. Dark Dirty Cockney Rhy. Sl.