A place predominantly occupied by women. This could be a workplace, classroom, social event or any other public place where there is, by a wide margin, more women than men. The term henhouse is used because of the conspicuous absence of cocks (roosters–in this case, men).

An enclosure for poultry.

Stuffin around like an old chook. Pecking a lot, but not laying eggs. Procrastinating. Indecisive.

Putting somebody in charge of a job, when they have a conflict of interest. Often used to refer to industry "self-regulation" or to putting an industry insider on the board that regulates that industry, e.g., appointing an executive of Comcast as chairman of the FCC.

Can also refer to a similar problem in private industry, e.g., putting the manager of a failed project in charge of the investigation into why the project failed.

When a man poses as a woman and gets outed.

Package had been delivered

A less explicit version of "You couldn't catch herpes in a whorehouse!" It means that no matter how hard they try, no one will be able to catch anything.