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A group of five people where only one person is doing the dirty work and the rest are just standing there like idiots.
My cousin's M-some was just me, my brother, my mom, my dad, and his friend. Only my brother was getting it done.
At the party, it was an M-some with three girls and two guys. Only one guy was even trying.
My friend’s M-some had five people, but only one of them was actually having fun.