Before widespread caller ID and well before cell phones kept phone numbers in the hands of people we want to have them, people could call you anonymously just to mess with you and there was nothing you could do. Well ... almost nothing. If some girls' sleepover posse got the bright idea to call you and then hang up while giggling, you could figure out that it was Susy Johnson who called you up, just as you suspected, just by dialing *-6-9. The only problem was that there wasn't much you could do in response because the girls could *69 your right back and ruin any plans of anonymous vengeance you may have cooked up.
*69-ing a Prank Call