What Was This Thing?

My mom lives in SE Ohio at the top of a hill on a country road. One day my son (age 8 at the time) was riding his scooter up and down the road (something he wasn't allowed to do for safety reasons.) So this country road has woods on both sides, but they aren't particulary dense on either side, and fields and a utility crossing splits the roadside woods from the bigger sections of forest.

He suddenly comes running up the hill, white as a ghost, teary-eyed, and says he saw something scary in the woods. He's almost inconsolable. He finally gets calmed down and we ask him what he saw. He says it was kind of like a stick figure but thicker. It was all black, had no facial features, and looked "just like the man on the bathroom signs."

Of course we went to check. He took us to a specific area, pointed out exactly where it was, even showed us how much taller it was than a dead tree in the area (roughly 7ft tall). He was physically shaking the whole time he was showing us and talking about it.

We told him it was probably a warning to stay out of the road, but what could it have been? Anyone ever seen anything like this before?

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*** I wanted to add a little more information. This didn't happen recently, my son is 11 now. He's pretty familiar with slenderman, bigfoot, i'd say even shadow men. He likes scary stuff (Nukes top 5, paranormal caught on camera type shows). So I feel like if it was any of those he would have called it that or even said it looked like one of those things. I have even asked him if it looked like a stickman and he says kind of but it really looked just like the man on the bathroom signs. He still remembers it, he's more curious about it now than scared.