How to map `df` in vim to delete the file under cursor

I know gf opens the file under cursor, which is so nice. But I want delete the file under cursor. Here are two questions.

1. Does df have any original(default) function in vim?
2. How to map df to delete the file under cursor?

Binding keys to blindly delete file is dangerous and should be avoided. On the other hand, it is not so hard to type such command interactively:

:!rm <ctrl-r><ctrl-f><enter>

So it takes only about eight key hits to do it safely.

I want delete the image file of markdown.

well, here is my solution

noremap df :call system("rm -f ".expand("<cfile>"))<cr>

I press df when the cursor is on a slash, and nothing is deleted.