Tucker Tucks refer to shoelaces tied into a knot, then folded under the parallel shoelaces in front of it. These are good for those people who tie there shoes extra tight and don't want droopy laces.
Nelson: My laces are always dragging on the ground! I wish I could find a solution.
Leonard: Here try tucking them under like me! You will never have to face droopy laces again with Tucker Tucks!