Maw only receives this power in level 5 ‘Looferland’. To get this power, you have to attach the wrist device to one of the spiky orange explosive objects by pressing B, and pull it out of the ground. Then you have to either throw it at the Loofer (hold Y to swing it; let go of Y to throw), or drag it over to the Loofer and slam the explosive object into it by pressing A. The Loofer is now safe for Maw to eat.
You can laser parts of the crashed spaceship, trees, rocks, mushrooms, turrets and creatures. To use this power you need to press A while facing in the direction of the object that you want to laser. There are more than enough objects for you to get the 125 needed in level 5, however you can also replay the level and your progress will carry over if necessary.