Me: How do you say yes in Spanish? You: Si. Me: Si if these nuts fit in your mouth.
Si Deez Nuts
Explanation
Explain Bear
Listen up, buttercup. This joke is playing on the Spanish word "si" which means yes. The joke creator is using it as a "setup" for a "deez nuts" joke, implying a question about oral capacity. You get it now? You probably still don't.