What is doing an alex?

When you leave the lane without saying a word, or abandon someone in general without letting him know.

- I died on top lane becuase my support did Alex on me!

-Hi Kate, why are you crying? Did he do Alex on you again?
-Yes!

doing an alex - video

Doing an alex is a very selfish act. It also means looking after oneself without considering the emotions of others. Border-line narcessistic.

He's not coming......He's doing an Alex