Derived from 'go pee'. Used in public when you are too embarrased to blurt out 'I have to go pee'. Instead you can say 'I feel gippish' i.e. I fee like I've to go and pee. Use it with your partner in public places and you'll never be embarrased to say that you have to pee.
I'm feeling gippish.
This cold me makes me gippish.