Prank in which unsuspecting person walks with back of pants lowered, in front of another person, then suddenly bends forward exposing his/her anus to unsuspecting person. Element of surprise is key. Derived from spring breakers partying off the Atlantic Coast.
Pedro was tragically introduced to Max's Atlantic-O as he was walking home; Chris was Atlantic-O'd hard by his now ex-best friend.
by ToDaLymit April 6, 2015
"Oh baby! oooooh!"
by Mario The Italian Plumber Guy March 11, 2004