The acronym for
Mountain Equipment Co-op. It is often found on
labels on
rainjackets,
tents,
backpacks,
thermal clothes (and
underclothes), and
climbing gear.
When spelled in lowercase, "mec" is the French word (from France much moreso than from Québec) for "guy" or "man". It is used colloquially more than in formal use.
What's up, man? > Qu'est-ce qui s'passe, mec?