"Jalice" is the merging of the two names of the charaters Jasper and Alice from the Twilight saga. It represents their relationship as a married couple, and to some people, Jalice are the only reason to read and/or watch the overall mundane Twilight saga as they are the only characters and couple in the series who make the saga interesting.
"Jalice are the only reason I can bare to sit through the Twilight Saga."
"Twilight should have been about Jalice instead of the awkward Bella and Edward."
"Team Jalice Forever!"
"Some Jalice fanfictions are much better than the whole twilight saga put together."