Not a lake name, but when people ask my dad where he caught his fish he likes to joke, “right about here” or “right in the corner” then make a hook out of his pointer finger and give them a graphic of how the fish was hooked in the corner of the mouth. Funnier in person than when im trying to explain it!
I remember a similar incident on a trip we made into the Quetico Provincial Park, Ontario. We had been camping and had good fishing on Sturgeon Lake and were traveling to the next lake on the trip. We ran into a number of guys on the portage leaving the lake that had a big stringer of eater walleye. Seem to remember they were from Alabama. Just to strike up conversation we asked where they caught them and they did the animated hook in the mouth thing.
The best example of keeping a fishing spot close to the vest I encountered was when I did a sea kayaking trip to Norway. At one of the coastal villages we were talking with one of the locals. A big cod he had caught was brought up in conversation and we asked for curiosity sake where. He wouldn’t reveal any information about it. So, in case you have plans to fish the North Atlantic Ocean… don’t expect a Norwegian to give you any fishing information.