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1.
A politicaly correct term for guts
Though Mohamad Ali may seem to have intestinal fortitude he is not healthy.
by Light Joker March 19, 2004
66 27
 
2.
Mental Toughness
Navy SEALs possess intestinal fortitude. Frequently heard during Hell Week.
by DeepSix66 October 15, 2013
3 1