Similar to The Big Large. An emphatic way to say "that sucks" or "that's bad". When something is The Big Mulch, it's extremely terrible.

Things that are The Big Mulch are more terrible than The Big Large.
Person 1: "Man, history class surpasses the ranks of The Big Large. History Class is The Big Mulch."
Person 2: "Wow dude it's really that bad? To call something The Big Mulch is a pretty big offence"
Person 1: "Trust me dude, school in general and ESPECIALLY HISTORY CLASS is The Big Mulch"
by Mr.Glub November 28, 2018
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