(informal, humorous, chiefly, North America) The week during which someone menstruates.
2008, Coco Tanaka, "[https://web.archive.org/web/20160330001130/https://issuu.com/joeatlacitybeat/docs/vol06issue36 Shark Week!]", LA CityBeat, Volume 6, Number 36, 4 September 2008 - 10 September 2008, page 17:
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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