Bollocks!! (profane vulgar) Poppycock! (old fashioned) (which isn't profane even though it's got, "cock" in it) Piffle! (old fashioned) Rubbish! What a load of shite! (Geordie. Profane vulgar). He's talking out of his backside/arse (vulgar) He's a gobshite! (profane vulgar "gob" means mouth it's slang, "shut your gob!") He just makes it up as he goes along! He speaks gobbledygook (no offence to my Korean friends!) Cobblers! He doesn't know what he's talking about. *drum roll please* drrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr He's a bullshitting bastard! *cymbal crash!!!* hahaha (very vulgar).......... You could put them all together, thus hehehehehe He doesn't know what he's talking about, he talks utter bollocks; poppycock; piffle; rubbish!! What a load of shite! He's a gobshit, he talks out of his arse, he just makes it up as he goes along; speaks gobbledygook; cobblers. He is a bullshitting bastard!!! hahaha vulgar and profane, but accurate and definitely native :D Or stolen from a Spike Lee film, "you talk more shit, than a little bit". (Vulgar)

I feel somewhat lighter and brighter and a bit happier in myself after that hahahaha