A useless human, typically male, entity acting to further the patriarchy, either intentionally or unintentionally.
The guy who messaged me on Tinder turned out to be a douche, imagine that!
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A human with no definable personality outside of the current cultural trends who came to be through strenuous and repeated attempts to fit in with a particular, and particularly horrible, crowd. They make a mildly annoying impression, if any at all, and are unaware of themselves and their social context. A tool can also be a douche, jackass, or Chet, but not all douches, jackasses, and Chets are tools.
I ran into Mike from high school, and yes, he's still a tool.