A tickle hard happens after you’ve fucked and orgasmed, and your clit/penis is so sensitive that you can’t stand for it to be touched because it causes an unbearable tickle, almost painful, but not quite in that category. It is just a tickle that is a hard ass mother fucker, causing one to jerk and display seizure like activity, and some may even pee from the sensitivity and the ticklehard.
Say, uncle, do you wanna kiss my pee pee until You make it tickle-hard?
from a Kevin Gates song "hard mat hurt your back when it's no option."
It's when you chill really hard
I'm just hard chillen at home.
When you'v gone past the point of chilling and going hard at chilling so therefore getting more chill which is a paradox
John: wag1 Alfie how are you?
Alfie: I'm chillin hard
(Alfie has consumed marijuana)