Ahh, I have wondered this for a while too!
Personally, I have had no "confirmed" experiences with ESTps, but I must've had many encounters with them in RL, but I still can not recognize them.
I don't know what I am supposed to really look for, more than the stereotypical traits associated with ESTps... and I don't seem to find any of them in people that I am around. I know way too many ENFps on the other hand. =/
The males that I think *may* be ESTp usually don't test as ESTp at all. One tested ENFp -__- yet again and I was really shocked. The others that have been ESTp I never would expect to be and it seems like they do sort of "pass me by" or slip under the radar in a way..
I still can't believe some of them are ESTp
Also, I can see myself getting "scared" around ESTps, but then again maybe my view on ESTps is totally wrong. I see them as very fiery, intimidating and always ready for action.. which is apparently a true description of them but that would actually frighten me somewhat.. I love extroverts but I guess I see assholes as being ESTp
a lot. Hopefully I am wrong..