For water drainage either in windows, masonary.

A weep hole is a small opening in the brick or stone mortar joint that is designed to allow water to weep from behind the wall veneer. That is right, the brick on your home is a veneer, a simple covering that hides the rough framing of the exterior wall of the home. 

A small hole or opening in brick to allow water to "weep" out/drain from behind the brick veneer.

It's a slow drainage hole ;) gotta witty one but I'll save it for another

Drainage basically

I believe it is a space in brick mortar.

I have no idea, but I bet it has to do with moisture. 

A place to cry over money lost in under estimating costs?

They are ventilation gaps left in masonary walls (usually brick veneer) to allow condensation to escape.

eyelids?

Yay -- I know this one! It is like the wailing wall but different! RIght? ???

That is the place when a tenant is being removed from a unit by the constable.

an exit for moisture in a brick veneer wall....

Common in brick veneer, they help allow water out, and air in. Flashing is normally installed in a mortar bed joint just below the weep holes. They also serve as a doorway for bugs and bees to build homes between the brick and sheathing.

A hole in the Weep Screed.

I may need to change clothes now.  I laughed so hard at this ... I cannot even respond. 

Something akin to the Pie Hole?

I wonlt be a smartass this morning and you already have your answer. I knew some of the gals here know how to swing a hammer!

drainage discharge.

Love Corinne Guest, Managing Broker sense of humor!

Tony and Suzanne Marriott, Associate Brokers Lyn Sims beat me to this one.

as said below...so water can escape and not back up and put pressure or rot a strusture

It looks as if you have been provided the right response to pacify your query.  

A bathroom!

It's used for drainage in any material - it is used in brick/masonry, stucco as well as interior (baths/showers).  However, many homeowners fill them with caulk, defeating the purpose of the weep holes!!

Think tiny drain