I'm remembering when I was 11 or 13, right in that age group, I called my brother a "jerk off"

Now, I had absolutely no idea of the sexual meaning of that, it was just something I thought you called anyone, male or female, meaning you thought they were being, well, a jerk, a fool. I'm sure I'd said it dozens of times, and didn't think a think of it. Just a brother/sister fight.
My mother heard me and went BALLESTIC. She had the old parenting style of take no prisoners (that's another story) and screamed at me "WHAT DID YOU JUST CALL HIM?!" That was the first it every entered my mind that something was wrong with that term, had no idea why. So, of course I said something non-commital like "huh?"
She (this whole conversation was being shouted by her from here out) asked "Did you just call him a jerko"?
I thought that word sounded really stupid, and anyway, that's not what I called him, so I said "No"
Yes you did, I HEARD you! Do you know what that means?
Me, being the master of the wrong answer said "yeah" meaning I knew it meant a dumb person.
I got yelled at awhile longer, never did figure out exactly what jerk off meant for a few more years.
Point is, JPB, your kids don't know that freaking if really just a milder form of something they really shouldn't be saying. Or do they?
In your initial post, it really took me back in time. Today, I would be dismayed at a parent saying the actual F word.
My parents never said that word, I never heard it come out of my mothers mouth until I was at least 20, and that was only because she was repeating what someone else said.
However, my parents Constantly said God damn. Something I rarely say.
Growing up I was called a "God damn kid" or we were referred to as a group as "you God damn kids"....I thought every parent called their children that, and when I finally had the ephinany in my 30's that they didn't, well, it kinda rocked my world.
I would much rather have heard her say "that's a freakin' good deal"
When my step daughter was, oh...15 or so, I never used bad language in front of her, and her father the same way. She came to visit us when she was about that age, and when the 2 of of "girls" were together alone, she dropped in conversation something like "so I told her that was bullshit" I could tell kinda feeling me out to see if I'd have a reaction.
I didn't, and I could sense a relaxing about her, like I wasn't going to treat her like a baby for saying a word.....I think she dropped the word **** in front of her father maybe twice from the age of 15 to 20.
When she turned 20, she again was visiting, and I walked in the room when she was telling her dad something really serious in her private life that had angered her, her anger was justified....As I walked in she was saying something like "I was so f***ing angry..." I looked at Mr. Tea, and he just kept a stone face.
When she left the room, I asked "Did you hear Miss Tea say F***"?
He was quiet, and said, "yeah....never heard that before...."
Now she's 27, and I can count on one hand the number of times I've heard her curse.
Miss Tea always knew what words meant. Maybe the kids who hear their mother say freaking think it just means "very"