[Adder]

A gay extension cord will have a male plug at each end.

And be pretty much useless for anything.

[Vaquero]

We make them up to feed juice from the generator into the house wiring once the mains are shut. Used it for ten days during hurricane sandy aftermath

[FirstFlaBn]

A gay extension cord will have a male plug at each end.

And they only use it by plugging it in somewhere it doesn't belong.

[Bob]

You can actually use a male-to-male extension cord, although not without some risk - You can extend AC from a workbench with power to another one by plugging the cord into a socket on each bench.