Funny Birthday T-Shirts. If you are looking for the best and funniest Birthday T-shirts, look no further than New Moose! We carry all kinds of hilarious Birthday inspired shirts and apparel. They make perfect gifts! Funny Birthday t-shirts can make your day go better and bring a little fun into the day. So if you are looking for something funny to wear on Birthday this year, take a look at our large selection and enjoy your Birthday with a little humor! In addition, you can bring a laugh to everyone at your Birthday party or wear this funny shirt out to the bar. Looking for novelty Birthday stuff, crazy and funny t shirts for guys and girls? Want to stand out this Birthday? Check out our huge selection of funny Birthday T-shirts and get some hilariously funny T-shirt ideas for your next evening out! Enjoy our large selection.