I always thought this expression was to be taken figuratively.
And I certainly am guilty of that definition.
But I will be a bit uncomfortable today on my flight back from Oregon.
I was camping. I put on my pants. 2 minutes later I said “OUCH!”
I put my hand down the back side of my pants. I felt something.
I pulled my hand out and lo and behold, there was a little tiny ant!
It bit my ass!
I have a rash 3 days later, and it is itchy!
But at least I can brag having had ants in my pants!
How many of you can say that?