Dude/duːd/ Definition 1 of 5Pro Tip 1/3Gender Specific Used mostly for men, can feel odd if used for women. I met this dude at the skatepark. Pro Tip 2/3American Slang Common in the US, less understood or used in other English-speaking countries. Dude, let's catch some waves! Pro Tip 3/3Friendly Tone Implies a casual, friendly approach, not for formal situations. Hey dude, thanks for the help!