Moppet/ˈmɑːpɪt/ Definition 1 of 2Pro Tip 1/3Colloquial Term Used in casual conversations rather than formal writing or speech. I met a neighbour's moppet at the park today. Pro Tip 2/3Endearing Qualities Implies that a child is not just little but also charming or lovable. Our little moppet has won everyone's hearts. Pro Tip 3/3Tone of Affection Often shows that the speaker feels fondness when referring to the child. The moppet's laughter is so infectious!