It's not a usual one. There must be context somewhere.
2011년 4월 8일
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cup,
it means who is somebody doing anything? hahahahaha!
2011년 4월 8일
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nice picture, who let the dogs out :P lol!
2011년 4월 8일
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There is a popular song in the US called "Who let the dogs out". In fact the phrase is repeated so many times in the song, it is hard to get it out of your head. I guess "who let the jam out" is a play on word after this song.