noun

• (uncountable) An unconventionally modern style of fashionable dress originating in England in the 1960s, characterized by ankle-length black trenchcoats and sunglasses.
• (UK) A 1960s British person who dressed in such a style and was interested in modernism and the modern music of the time; the opposite of a rocker.
  "It was “Mods” against “Rockers” and the police against both as this quiet seaside town of 28,000 exploded with teen‐age violence during the Easter weekend. […] The “Mods” or “Moderns” wear sharply cut Italian‐style suits and long, pointed “winklepicker” shoes. They ride motor scooters fitted with scores of gleaming accesories^([sic])."
• (informal) Clipping of modification.
• (video games) An end user-created package containing modifications to the look or behaviour of a video game.
  "Since Doom II, thousands of gamers had begun modifying id's products and making them available for free online. Doom fans would communicate entirely over the Internet to create mods of the game—often never even meeting in person or, for that matter, talking on the phone."

verb

• (transitive, informal) To modify (an object) from its original condition, typically to individualize and/or enhance the performance of the object.
  "His friends were particularly impressed with the way he modded his Ruckus."
• (video games) To install or create a mod.
  "Learning Java is what got me into modding Minecraft."
• (transitive, Internet, informal) To moderate; to silence or punish (a rule-breaking user) on a forum, especially when done by a moderator.
  "Don't break the rules or you'll be modded."

adj

• (MTE, slang) Crazy, insane.
  "Have you listened to Kendrick's new album? It's absolutely mod!"

name

• (UK politics) Initialism of Ministry of Defence; also MoD.