Acronym for "Just Nod & Smile".
The term is used to advise what to do when someone is talking at you with gusto about a topic you either:
a) dont care for
b) have no idea about
Rosie: I just adore the thermodynamics of custard blah blah....
Dude1 (whispering): What the hell is she talking about?
Dude2 (whispering): JNS dude, JNS.
No,not like the resturant. The act of a girl jerking a man off, then quicklyswitching to giving him oral pleasure so that he may reach orgasim, hence the acronym JNS Jack-N-Suck.
When you have sex whilst watching JNHackers. It is said to be the most pleasurable thing that a human being can experience, along with being the most intimate thing a human can do with another, many have tried and failed.
"Bro she let me have JNSex I have to marry her!"
"Lets have JNSex tonight remix!" "OK!"
"Honey, I think its time we took it to the next level, LETS HAVE JNSEX!"