Saturdays are for the boys
A legit excuse to tell your spouse you would rather hang out with your male friends on that day than engage in trivial activities with the aforementioned.
Example:
Spouse: We're having dinner with my coworker Janet and her boring husband Ben tomorrow.
You: Can't do darling, Saturdays are for the boys.
Spouse: We're having dinner with my coworker Janet and her boring husband Ben tomorrow.
You: Can't do darling, Saturdays are for the boys.