Top Definition
A slang term used to refer to those, often from the Pacific Northwest, who prefer drizzly, overcast weather to sunshine. The term alludes to these people preferring to spend so much time out of the sun that moss grows on their backs.
"What do you mean you don't want to hang at the beach?! It's gloriously sunny in Seattle!"
"I don't know, man. I'm kind of a mossback. I miss the rain. I can just hang inside with a sweater and a good book."
by R. Pompeo March 17, 2016
a very conservative or reactionary person, especially one with old fashioned beliefs or values
I don't need to listen to an old mossback to know that things are messed up.
by The Return of Light Joker October 24, 2011
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