When you mean to use the word thing but say person instead and then try to correct yourself.
That's a nice person-thing for you to do.
While this is a sexual innuendo, it is often a misunderstood phrase by the naive and used as general cause and efffect.
The pastor suggested two people go out for prayer but when she used the phrase, “one thing led to another” the parties misunderstood and ended up taking things further then intended.
When you cheated on someone but you excuse it as something that "just happened" and you didn't want it to. It rarely works because you're a human being and you can control your actions.
Jake: Babe sorry we were just hanging out, I complemented her makeup, and one thing led to another, I didn't mean it
Mary: Yeah right, we're done Jake!
Something ridiculous, hard to believe or something which can never exist or happen
Bro 1:- bro fouzia thinks she's the perfect girl
Bro 2:- bro that's the most chutiya thing I've ever heard
the thing under your desk that you can pull out for your keyboard
I don't have enough place on my desk, i need an underdesk keyboard pull out thing