Short for "Jack's tears", an online joke about how often Jack Shephard cries on ABC's LOST television program. Fandom bloggers recap episodes according to a Jears-O-Meter and create macros about Jack's emotional instability.
Ack-Attack: "Matthew Fox needs lessons from Jeffrey Dean Morgan on how to cry like a man! *jears*"
"It was like 80 degrees with a 100% chance of JEARSTORMS!!!!"
Painting big blue teardrops on Jack's photos with MS Paint.