Some people say "wiggle", some "weaving", anyway, it is about skating on just one skate.
I saw some videos how it looks like but only one video how to actually learn that move -- pity the video is about roller skates: How to improve your balance, stability and steering on inline skates or rollerblades. -- I am not that sure if everything applies to ice skating.
For now I can only glide (no propulsion) on one foot, I cannot gain speed, and eventually I stop. I go ice skating daily and for 2 weeks -- no progress.
Maybe there is is some exercise which would help me "catch" the drill and go further do full wiggle.