I have a small dick
It's like your dick is a side joke in a comedy sketch. Don't take it seriously. It's not a tragedy. It's just a funny little thing that makes people laugh.
You walk into a bar and the bartender says, 'Hey, I heard you're not the biggest guy.' You say, 'Yeah, but I'm the funniest.'
Your friend says, 'You're like a mini-meme.' You say, 'That’s the best compliment I’ve ever gotten.'
You tell your mom, 'I’ve got a small dick, but I’ve got a big personality.' She says, 'That’s why you’re my favorite.'