To send someone the gnome (fig.): to dump somebody preemptively, to take the initiative in a break-up, to terminate a relationship with extreme prejudice
I knew he'd lost interest, so I sent him the gnome.
I found out he'd been seeing someone else, so I sent him the gnome.
Jen really needs to send Brad the gnome and move on.
If you don't send her the gnome, you'll just end up feeling used.