Implicit derivative definition. Fabricated for the purpose of taking attention away from the most notoriously clueless and desperate forum poster, from which the term "debface" was coined. "Jillface" should be used as a suitable replacement to properly annoy Deb.
Deb: "omg I am single and supposed to be a female I think who ate a larger boy who is residing inside me but lent me his haircut instead.
GB: /jillface (collective expression)
a look of complete uninterest or disgust
I tried to make a joke about my best friend's bad breath, and she snapped around, shot me a jillface, and walked out the door.