The unfortunate phenomenon when you are unable to shower, clean, wash, or freshen up your private parts, and the resultant stench that occurs. Gitch comes in both male and female forms and is nasty and gitchful regardless of sex. The longer you go without washing, or the more strenuous activity you perform (such as exercise), the stronger your gitch will be.
"Man, I haven't had a shower in 3 days and my balls are FULL of the gitch"
"Even just sitting here, I can get wind of my own gitch it is that bad"