Special First Time

Alright listen up, chucklehead. This dude is saying he wanted his first time to be special, right? But then he says it was with someone who has Down syndrome. The joke is that people with Down syndrome are often seen as less desirable, so it's messed up to say he wanted something special but then picks someone society sees as "less than." Basically, it's funny 'cause it's wrong, and you're probably laughing 'cause you're not exactly winning any smart contests yourself.