When the tickler is really, really tickling hard and relentless. Not a lot of clips actually has it. Most of the time it looks like the ler is barely touching the lee.
Yeah rhiannon, I totally agree with you there! Sometimes, I wish some of the 'lees in the videos here could go to "tickling school" to learn how to really tickle.
its a scale thing, its hard define exactly what hardcore is as its opinion based really. What's hardcore to some may be a walk in the park for others. See it as the more challenging end of tickling endurance... whatever that may be to you.
Like Harbarish said, hardcore is destroying the lee. Usually tight bondage and long/intense tickling. But to a lee that can't stand light touch. Hardcore could be light touch for them.