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A jackmunch is a smelly, loud, and usually drunk person who loves to hum while doing things that make other people want to punch them.
My uncle is a jackmunch. He hums show tunes while eating pizza at 3 AM.
The guy at the bar is a jackmunch. He hums and tries to flirt with my mom.
My friend's dog is a jackmunch. It barks and hums at the mailman every day.