^W

Etymology
From the visual representation of the terminal encoding of the keypress Ctrl-W, the "delete back to whitespace" command in GNU readline, which is commonly available in GNU shells and other command-line utilities.

Interjection

 * 1)  Delete that last word.
 * Yeah, he's a real jerk^W civility-challenged fellow.
 * Well, Mimi, you’re old enough that you should go to parties now, so this should be your last year to tickle feet^W^W trick-or-treat.

Usage notes

 * This may be repeated to indicate the deletion of multiple words.