Amp "timing" ?


I was reading someone raving about the impeccable "timing" of their high-end amp this morning.  I have heard this term tossed around several times recently in my dive back into highish-end audio. 

Can someone please explain what is meant by this term?  Is it snake-oil or confirmation bias?  I just don't understand how a human  can hear  a timing difference of a soundwave unless it's a 2nd+ order reflection.  

Thoughts?
dtximages
Well, I've even read it in Stereophile when they reviewed pre-amps.  It seems like there's a new hot topic of listening placebo every year or so.  I've seen people describe better/worse timing several times and just wondering if this is more audiofraud minutia or if it's a very clear distinction that can be relatively easily recognized by a critical listener. 
dtximages 
... just wondering if this is more audiofraud minutia or if it's a very clear distinction that can be relatively easily recognized by a critical listener.
This is the logical fallacy of the "excluded middle," aka tertium non datur.