The phrase "in his wheelhouse" is also used in ice hockey. When a player takes a pass in perfect position to shoot the puck on net without readjusting in any way, it's said to be in his wheelhouse. I'm not much of a baseball fan. I had no idea that's where the phrase came from.
My younger daughter's first word was spoken while we were visiting the Brookfield Zoo in Chicagoland. It was hippopotamus! We were at the hippo display and had used the term several times. My wife was holding Anne and I asked her if she could say 'hippopotamus', and she did. Her mother and I were flabbergasted.
Oh, I forgot to say that she was less than one year old when she said that.
"Good leather" caught my ear and I had to write in -- it's a rodeo term. The 'leather' is slang for a saddle in bronc riding. If a bronc rider 'parted leather' or 'lost leather', it meant he got bucked off. If the rider managed to stay on his bronc, he had 'good leather'. So if someone slaps you on the back and says "Good leather!" after you've finished a project, it means you stuck to it and did a good job.
If you're speaking voice sounds like grunting, you're said to be gruntulous.
Did you mean "your speaking voice"?
Is this another example similar to "there" and "their"? (In that separate thread is where I expressed my opinion about homophone errors.)