former Prime Ministers Trudeau's answer when asked what he said by the speaker of the house, he really said fucking bullshit, thus it has that meaning.
A euphemistic substitution for "fuck" or "fuck off". Canadian Prime Minister Pierre Trudeau caused a minor scandal when opposition MPs claimed he had mouthed the words "Fuck off" to them in the House of Commons in February 1971. Pressed by journalists, Trudeau later unconvincingly stated he may have said (or mouthed) "fuddle duddle or something like that." Trudeau likely got the word "fuddle duddle" from the official Hansard transcript of his words for that parliamentary session. The Hansard reporter couldn't make out (or chose not to record verbatim) what Trudeau had mouthed, and chose to write down the now-infamous phrase instead. The phrase then took on a humorous connotation for Canadians.