In the 15th century, the word "hogwash" meant, literally, swill (
refuse from human meals, food preparation, slaughterhouses, etc.) that was fed to hogs: pig slop. By the 18th century it was used metaphorically as a pejorative term for cheap liquor. From that it was expanded to mean inferior writing, and ultimately it just came to mean anything a person wrote or said that was stupid, incredible, or deliberately false. In speech it's fallen out of fashion amid today's coarser language, but in writing it's a polite
euphemism for words like "bullshit," "horse puckey," etc., which carry the same meaning (although they refer to the other end of the animal

) and apply to a much wider scope of targets than language, including a poorly planned project or a ruinous government program.
new bells and whistles to tout = ?
In the early days of the Industrial Revolution, inventors competed with each other to bring products to market that the public found impressive. Since most laymen didn't really understand industrial technology, they could be impressed by trivial features that made a device seem fancy but actually did not enhance its functionality. Many contraptions had a few bells that served as warnings or indicators, and a few whistles that might serve the same purpose but could also simply be exhaust valves for steam engines. People came to associate the sounds of bells and whistles with state-of-the-art "high technology" in the 19th century. So by adding more bells and whistles an inventor might make his product seem to be more elaborate than those of his competitors.
So today, when we talk about a company adding "more bells and whistles" to its products, it's a
pejorative term meaning new features that seem, at first glance, to be impressive, but actually provide very little additional value.
nix = To forbid, refuse, or veto:
This is German slang,
nichs, a slight simplification of
nichts, which means "nothing." It came into English in the late 18th century and I can't explain why. Our language has borrowed very few German words, compared to French and Latin. Perhaps it's a legacy from the
Hessian mercenaries who were recruited to fight in the American Revolution, but that is a completely uneducated guess.
In American slang it originally meant "no" or "nothing," but its meaning expanded to become both a verb and an exclamation: "Nix! The cops are coming!"
From Elvis Presley's big hit song "Jailhouse Rock":
Shifty Henry said to Bugs, "For heaven's sake,
No one is looking, now's our chance to make a break."
Bugsy turned to Shifty and he said, "Nix, nix!
I want to stick around a while and get my kicks."
Let's rock, everybody, let's rock.
Everybody in the whole cell block
Was dancing to the Jailhouse Rock.