[justinlink]

It's a reference to something Nancy Pelosi said when passing Obamacare.

"We have to pass the bill so that you can find out what is in it”.

[paulddraper]

Often, that's literally true due to the length and complexity of the legislation.

Which is why there is the proposed Read the Bills Act. [1]

[1] https://en.wikipedia.org/wiki/Read_the_Bills_Act