The Yule Lads are 13 troll lads who bring present to your home if you've been good- or a potato if you've been bad!
Each day corresponds with a new Yule Lad, who'll stay in your town causing mischief for 13 days (make sure to keep an eye out in shopping centres or museums). Today's Yule Lad is Askasleikir, also known as Bowl Licker.
An askur is a type of bowl with a lid which was used instead of a dish in days of yore. When children took their askur to bed (perhaps for a midnight snack) they would store the bowl under their bed or on the floor. Askasleikir likes to hide under the bed so he gets first dibs of whatever's in the bowl.
He licked the inside clean- he didn't even leave any leftovers, bit selfish. Tomorrow's Yule Lad is Door Slammer.