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A might do is a person who says 'a might do' when you ask if they have filters so you can roll a cigarette while both of you are wasted and probably going to fail math.
'A might do' he said, then passed me a crumpled filter from his pocket.
'A might do' she said, then went back to staring at the ceiling.
'A might do' he said, then fell asleep mid-sentence.