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Origin - from the [fountain pen] [collector] [community]. You go to a yardsale which has just opened and expect they might have a whole load of nice pens, pen parts, etc., and then you ask the folks there whether they have any of those. Most likely they would reply "Some guy bought them all this morning." "Sumgai" is the short form of "some guy," if you become a sumgai, then you're the lucky person who got to those yardsales (or antique fairs, online auctions, whatever) and bought those pricey pens or pen parts for a v low price before someone else came along and bought it.
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