Orange You Glad

Listen up, nimrod! This joke is all about wordplay. The person is saying that even though there are many "oranges" (actual oranges), they still choose their special someone, using "orange" as a stand-in for "are" to create a silly pun. It's like saying you're the best pick from a whole basket of fruit, even though the joke is not that fruitful. You probably have a hard time counting to ten.