Stingin

Stingin is an adjective that describes anything cool or just generally good, such as rad or dope. However stingin is a bit more specified for something unique or uncommon

"Damn, where'd you get that chain? It's stingin!"

Stingin'

(adj) 1. taking part in sexual activity
2. Taking a drug by needle such as heroin
sting-in

ex 1#: Me and her got stingin' last night
ex 2#: I been stingin' lately, feels nice