bull butter

Definitions

1. margarine
   dated, derogatory, uncountable
2. bullshit
   euphemistic, slang, uncountable

Examples

“About one-third of this importation was margarine, which in America was called "bull butter."”

“(for you city folks, bull butter is that black, smelly substance found in piles all over cow pastures) but in your case, the bull butter ain't on the outside.”

CEFR level