horseshit
n. uncountable C2 Proficiency US //ˈhɔɹsˌʃɪt// UK //hˈɔːsʃɪt// horse·shit
n. a very rude and offensive way to say something is not true or is nonsense. You use it when you are angry or want to show someone is lying.
n. an extremely vulgar and offensive expression used to describe something as nonsense or a lie. Often used to dismiss an argument or statement as entirely false.
I don't believe a word of that horseshit.
He told me he was busy, but I knew it was just horseshit because he was at the bar.
The politician's latest speech was dismissed by the opposition as pure horseshit, lacking any concrete evidence to support the claims made about the economy.
From horse + shit.