testicle fortitude 

The adjective form of testicle is testicular. The phrase should be "testicular fortitude".

I just met a guy who can't tell the difference between a noun and an adjective. It takes a lot of testicular fortitude to display your ignorance in public like that.

testicle fortitude by My dixie wrecked November 25, 2003

testicle fortitude 

means having balls, bravery, courage

if ya wanna win, u bettah reach down and grab for sum testicle fortitude

testicle fortitude by Inflame November 23, 2003