What word or phrase does your mother always say?
usually fiddlesticks; 15c., originally "the bow of a fiddle," from fiddle (n.) and stick (n.). Meaning "nonsense" is from 1620s.
Nonsense; foolishness; bullshit: When I explained, she only said, ''Fiddlesticks!''
[1857+; the singular form is found by 1600]