Duckface (duckface) is the position of the lips "dubbing", that is, "bow", which can often be seen in pictures of girls on social networks.
Duck translates as "duck", and face - "face".
Most girls for some secret reasons believe that by making a daksefs, they will become even more compelling and stunning. The guys have their own opinion on this.
Dakfeys is in the list: Slang