What does full bellies and spanish blood go hand in hand mean?

Oh, dude, that phrase means that when you've had a good meal, you feel satisfied and content, just like how Spanish people are known for their passion and zest for life. So, like, when you've eaten well and you're feeling all lively and energetic, it's like you've got that Spanish blood pumping through you, you know what I mean? It's all about that good food and good vibes, man.