the former
I believe the latter is a snooker term, lately they have been mentioning that alot on snooker broadcasts and referring to it as a "problem" which always struck me as odd since that type of kick occurs on many many shots, albeit
often undetectable by the human eye
The first time I heard the term kick shot in reference to a pool match was during the old PBT telecasts
I can tell you that the term was completely foreign in Canada during the 80's