Well; it's a new hip word with the youngens these days. It just means "that's how i feel right now" or "extremely relatable". They use it primarily when that is the heaviest emotion in their life at that point in time.
Timmy: “I hate myself so much”
Jimmy: “Big mood”
by Jim Noobert June 6, 2018
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Originated from Danish, but the internet being the internet changed the meaning. (Originally this meant to be even cited or happy), to now be slang for something entirely else, often being the polar opposite of happy.
Original use:
Tom: Hey Tim are you in a big mood today!?

Tim *excited*: Yes Tom, I am!!

Current Internet use:

Tim: I’m dead inside man

Tom: Big Mood
by hedgelinghog July 15, 2018
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when you relate strongly to a moose
big moose 1: did you see what our moose daddy kenny tweeted?

big moose 2: about how hot josh dun is? big boy meese mood
by kennys.big.moose.2 September 4, 2018
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A Big Mood refers to a big steamy dump you take after a (heavy) meal.
''I just had a Big Mood and it tore my asshole apart''.
by Steamyd January 15, 2020
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You know what this is. Go away boomers, its not a slur and neither is the word boomer. Stfu.
(Video of gorillas throwing their own faecal matter)

Me in the comments: big mood.
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