Conjunction of '
Friday' and 'Cliffhanger'.
A particularly suspenseful ending to a TV show or story that occurs on the
Friday episode so that the audience must wait the entire weekend before the conclusion/resolution.
Coined (possibly as a typographical mistake) by the subscriber 'dabbeljuh' to Max
Barry's book Machine Man, which is being delivered a page a day to subscribers until complete, which typically has a 'Friffhanger' every week.