Short for blowjinski, a derivative of blowjob.
Bro, I heard this girl down the street gives a mad jinski.
A masterful blowjob. One given with such fervor that the lady is placed in the top tier of jinski artists.
That chick u said was so good gave me a double c jinski last night. It was legendary. She also said we were exactly alike haha. I think we should get one from her at the same time.