User hover cards allow you to show off your awesome to other users in our network.
A noun ("reputation"?) should come after "awesome".
This is a bit of a joke moreso than an actual typographical error. It's using "awesome" as a noun, technically meaning "awesomeness" but cut short, well, I guess that's supposed to be "awesome".
A revised (and more in-depth) description is currently present on Meta Stack Overflow's privilege page and will be rolled out to other sites, including this one, eventually.