When you're low-key flexing to your employees about what you'll be doing with your s/o later.

This is when you turn the water on to drip slowly for the water line not to freeze over

A sink that collects cum from December -1st till the end of October, once No Nut November (NNN) arrives, the cum inside the Cum Sink will be left to thicken into an exquisite stinky cheese that will be harvested at the very end of November in time for Destroy-Dick December (DDD).

While your fist is inside someone's rectum, you pee in the sink simultaneously.

To have sex.

A person who is a bitch and is like a sink in which he or she can wash their hands in but is still a bitch

Four sinks are a group of very funny people who male youtube videos, however the upload scudule is not the best but they are still one of the greats.