Dwarf Offense

Alright, listen up, you big dummy. The joke plays on the phrase "grow up." For a dwarf, literally 'growing up' means getting taller, which is something they can't do, obviously! But "grow up" also means to mature and stop being so sensitive or easily offended. So, it's a clever, if a little rude, jab using both meanings at once. You're probably scratching your head right now, aren't you? That's okay, I'm here to spell it out for you.