rag week

listen to the pronunciation of rag week
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The days of the month when a woman has her period

I wouldn't bother trying to get off with her – it's rag week.

An annual event in many (mainly British) universities where students engage in unusual activities to raise money for charity
rag: a week at British universities during which side-shows and processions of floats are organized to raise money for charities
Attributive form of rag week, noun