Did he say yodel? What do Yodeling and Skylanders have in common? Well if you had Head Rush, one of the Earth Element Trap Masters, then you would know that one of her abilities is Yodel. She lets out a powerful yodeling attack, hurting all enemies within earshot.
This same skill is also one of the paths that you can take during your upgrade phase. She gets three extra upgrades to her yodel ability that allows the attack to do more damage and even destroy the ground beneath her.
My wife plays this character in our little Skylander Universe, but I can say from first hand experience that the Yodel can be very destructive to enemy minions. The added benefit of destroying the ground beneath the enemy is just icing on the cake.