Tits are like Lego bricks. They're there for the kid, but dad ends up playing with them.
Lego Bricks
Explanation
Explain Bear
Listen up, smoothbrain. You think this is about toys? No, you absolute melon! It's about boobs and dads getting frisky when they're not supposed to be. It's a classic case of a "dad-joke", which by the way, means it's dumb and not funny.