First this is not a drink!
Instead it is a  way
to start a hole for a screw.

As shown on the right

the end of a gimlet is pointed like a screw.

You twist the handle and
you have a perfect hole
into which the screw fits perfectly.

With the advent of electric screwdrivers
and self tapping screws
very few people have ever seen a  Gimlet!

Now you are one of them!