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1 definition by WarDubO

 
1.
Typically one week of extensive mental and physical training in order to get in shape for actual conditions. Another form of initiation or re-socialization.

Usually military related, sports teams and fraternities and sororities.
The football coach recommended to stay hydrated because there would be limited water breaks during hell week.

Once off the bus, the army recruits were stripped of their personal belongings and it was followed by intense interval training as a hell week introduction.
by WarDubO February 08, 2009