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Japanese slang for "uploader", as in somebody who uploads files. Pronounced "upunushi". Combines うp (upload, pronounced "upu") and 主 (master, pronounced "nushi"). Commonly used on sites such as Youtube or ニコニコ (nikoniko, a common video platform in Japan similar to Youtube).
しゅーやさんはとてもいいうp主 - Shuuya (Japanese letsplayer) is a very good uploader.
by DisgustingWeebs February 19, 2017
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