Personalized Merry Elfing Christmas Youth T-Shirt. Merry Elfing Christmas! It's not cursing, it's elfing festive. Let everyone know you're elfing thrilled with Christmas with this funny gift. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.