Potter: The killing curse (causes instantaneous death); one of the three unforgivable curses.
Post-Potter: An exclamation, uttered in frustration. Example: “Avada Kedavra! Learn how to drive, soccer mom!”
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Potter: A magical creature required to be a servant to a witch or wizard.
Post-Potter: A houseguest who’s overstayed his or her welcome. Example: “That sister-in-law of yours is becoming a real house elf.”
Potter: Allows wizards and witches to travel through the Floo Network, a portal connecting many magical households and buildings.
Post-Potter: Drug slang. Example: “Damn kids these days, gettin’ all hopped up on that floo!”
Potter: One who speaks parseltongue, the language of snakes.
Post-Potter: A friend who lives to hear his or her own voice. Example: “Blah, blah, blah. Man, she’s such a parselmouth.”