The movie "Inception," I've never seen it but it comes up in a lot of pop culture references. If you've seen the movie, What is their definition of the word "Inception?"
Based on why I've heard it seems they use the word to be a synonym of the word "paradox" (?)
But according to the dictionary, inception means commencement or beginning or initiation.
What is their definition of the word "Inception" in the movie?
Planting an idea so deep into someone else's brain, that they themselves believe they were the ones who came up with that idea.
Which is actually a pretty basic psychology and most adults have the capability of doing this to other people. But in the movie, they use super-tech / dreams-within-a-dream stuff to do this effect.
To be fair, in real life you would do this by building a rapport and slowly introducing an idea over time. In the movie, they were trying to do it in a very short time while also hiding the fact that their targets had met them in the real world, and it’s heavily implied that ideas planted in this manner were far more unshakable than those planted by normal methods.
The comments about planting ideas in someone's mind are correct to the plot of the movie, but most of the time I have seen Inception referenced in popular culture it has been to simply say "something inside of that same thing". It's like the Xhibit (no idea how the rapper actually spells his name, but I think that's right) meme: "Yo dawg, I heard you like _____ so I put _____ in your _____ so you can _____ while you _____."
This is because in the movie, they travel into dreams within dreams.
For you or anyone that's curious, it's Xzibit (a bit more phonetic than your guess which was probably close enough that anyone who knows, knows who/what you meant)
Not seeing a straightforward and true answer here so:
In the movie, they go into deeper and deeper layers of dreams within dreams. So the term "inception" came to mean things inside other things. Like if there was a lake on island on a lake, which in turn was on an island on yet another lake, you could call it lake-ception.