Where the guys give good sex to the girls, and they always say "oh" because it feels so good.
"Oh baby! oooooh!"
by Mario The Italian Plumber Guy March 11, 2004
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 06, 2015