WTH??

So... today was a nice day- high 70s I think. We decided to get out and enjoy the weather. We grabbed a bite to eat and took it to the park. Everyone was out enjoying the weather. Folks were playing tennis, kids were playing in the play area, and birds were chirping. We sat a picnic table (Dude, myself, Maurissa and Myles) eating. I happened to look up and saw a man with two ladies with quite a few kids. The ladies were giggling and struggling to gather the kids before crossing from the parking area to the play area. The man stood out because he wasn't helping them and because he had bright red hair and was dressed in this black, karate-kid looking outfit. It reminded me of the black and white karate-type outfits that guys would wear in the movies who could not fight. You know the ones who would swing the numb-chucks? and make a whole bunch of noise. Then they would get knocked down or killed with one blow or kick, once they stopped all that nonsense. Anyway... when I saw him, I chocked a bit on my food and without thinking said,
"What in the world does he have on?"
Then our four-year-old, WITHOUT THINKING, looks and adds,
"Yeah, what the hell is he thinkin' about?"
Everything stopped.
I didn't hear the birds chirping anymore, the folks playing tennis or the 50 kids and parents across the street in the play area.
Dude looked at me and I looked at him. I looked around, trying to process it. Did he just say-
"What did you say?" Dude asked.
"Uh, uh, Daddy, do you have some more ketchup in that bag?" I asked.
I didn't want to give it too much attention and I wanted to see if he even knew it was a bad thing to say.
We continued eating and then turned our heads, confused. I mean it was not funny but it was... something. I didn't know if I should laugh, because he is four and didn't know or if I should grab a BRANCH from one of the trees and whip his little butt. We both tried not to laugh.
A minute or two passed and I felt more comfortable asking him,
"Uh, Myles where did you hear that from?"
"What, mommy?"
"What you said about that man," I answered, taking a sip from my drink.
He pointed and answered, "From you."
Chocking, I asked him what he was talking about.
Dude looked at me.
Then our six-year-old added her unsolicited words.
"Yeah, from your conversations on the phone sometimes!"
"You don't even know what I am talking about," I told her.
"When you say, 'What the hell'," she said.
Dude glared at me convincingly.
I really could not remember a time I'd said that and especially in front of them.
With an attitude I told Dude, "You just lucky you ain't been busted!"
(Oh, I ain't just gone be wrong and hold my head down now.)
"Yall shouldn't be in grown folks conversations anyway!" I yelled.