Personalized Yee Haw Birthday Youth T-Shirt. Cute birthday Youth T-Shirt - White with little cowboy holding balloons. Wild western style text says YEE HAW IT'S MY BIRTHDAY! Perfect for a little buckaroo! 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.