Quote Originally Posted by Ran Kizama
1. y/n 508 up, 451 down
Saying y/n parodies the old DOS programs people used back in the day. It means yes/no, and some geeks still use it when they ask questions.
For example:

"you want me send you that file y/n?"
"you wanna come out y/n?"
"y halo thar buttsecks y/n?"