There are more made up definitions for chameleon types in MBTI lingo as well. But as I understand the usual slang term chameleoning with MBTI means the ability to mimick other cognative functions. Not the ability to attain and use other cognative functions. As the latter is quite impossible or at the very least wouldn't likely have the desired outcome.
Types that are capable of detaching themselves from the world, themselves and their own feelings, are known to be very good at being chameleon in any situation. Not for extremely long periods of times, because it requires some concentration and definatly drains you more than just being yourself (naturally).
NP's, in particular INTP's are known to be pretty good at chameleon'ing on a regular bases.
I can't imagine J's being too good at it though. I think it's mainly a perceiver thing. Intuitive obviously helps with the execution of said chameleoning. Though a sensor wouldn't be incapable of it. Introverted people also seem to have a leg up on extraverted people in that introverted people have an easier time detaching from the norm. And thinkers have a leg up on feelers, because if you act upon your feelings, as a feeler, being a chameleon would obviously feel wrong and may drain the feeler very rapidly. Whereas a thinker would be able to last longer.
A chameleon type does not use other cognative functions than the cognative functions that are strong to his type. Chameleon'ing is a method of mimicking cognative functions by using the main cognative functions in a certain way.
TiNe (INTP's) is specifically suited for that process. But an INTP acting like a ESFP or INTJ or ENTJ or whatever the situation calls for. Is still an executing INTP. He doesn't rearrange his cognative function order or anything like that.
By attempting to forcefully use undevelopped cognative functions, for example Fe for me. Would result in extreme drainage, and I will become a grumpy angry person in no time. But mimicking Fe on the other hand is quite doable while maintaining my posture.
It's tough for us to chameleon around people we are close to or trust though, because that clashes with our sense of rightiousness. And we remain ourselves around those people.
Chameleoning is very effective for me in my line of work however. Customer relations, employee relations, etc. I maintain most of those by chameleoning. I even have a J mode that isn't like I try to force using other cognative functions (difference between J/P is biggest of all four letters cognative function wise) but I am capable ot mimicking J's planning and working with deadlines things when it's neccesary to get things done. But it's more like I numb down my own cognative functions to stick my brain into a certain pattern to get things done.
I've been known to see and dream numbers for hours on end after a day of doing boring administration work for example. I have to check all my work though because in that mode I am prone to make mistakes. I know I am so I can deal with it accordingly luckily, and that's where my cognative functions come to play again, as I can easily find and correct my mistakes and find it fun to do so.
But I'm starting to rant about too many things, I'll end this post for now.
