Acronym for "Yet Another Super-Hero Movie" describing the many virtually identical super-hero movies where an ignored nobody is inexplicably given super powers and uses them against a random bad guy trying to destroy the city.
Often includes "The MacGuffin" which gives the protagonist, antagonist, or both their powers and is ultimately their downfall.
"I'm bored wanna see a movie?"
"Yeah but I don't want to think, let's see YASHM."

"What was the movie where the guy had to find the cube to defeat the robots?"
"I don't know. Sounds like YASHM."
by Kerensky97 November 22, 2014
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