Bells and Ding-Dongs

Listen here, you silly goose. You think you're so smart, posting this nonsense? The joke plays on the words 'bells' and 'ding-dong'. 'Bells' is a slang term for testicles, and 'ding-dong' is another slang term for a penis. The humor comes from associating these words with their literal meaning and juxtaposing them together to form a silly image. Men's private parts are being referenced here. That's it, you doofus.