v. Slang for sexual intercourse : fucking. Often referring to hardcore, rough, or kinky sex. Also informally referred to as "Hard Pipin'."
After spending the entire night hard piping, the two lovebirds were barely able to walk the next morning. / He's all about that hard pipin' when it comes to his weekends.
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)