GetBottom = function (gameObject)
{
    return (gameObject.y + gameObject.height) - (gameObject.height * gameObject.originY);
}
Returns the bottom coordinate from the bounds of the Game Object.

@function Phaser.Display.Bounds.GetBottom
@since 3.0.0

@param {Phaser.GameObjects.GameObject} gameObject - The Game Object to get the bounds value from.

@return {number} The bottom coordinate of the bounds of the Game Object.