After Obama and Childs' first meeting, she spoke with the senator by phone when he called to ask permission to incorporate the slogan into his campaign, specifically, on his Web site.
"He called me, actually it was just an accident that I answered the phone," Childs said.
"Normally I don't answer when there's a strange voice and I said excuse me? I don't have time to be playing a game, don't play games with me," she said. "He went on to say, 'did you realize you are a celebrity? Everywhere we go, they're singing your slogan, 'fired up, ready to go.'"
Tuesday's event was part of a statewide tour to build momentum for the senator leading up to the first primary in the South.
"We're ready to go on Saturday," Childs told ABC News after Obama had left the stage. "It will be a landslide in South Carolina." Childs promises she'll be the first person in the county to cast her vote.
"I'm going to register at my precinct at 7 a.m. when the doors open...My plans are to be the first one to vote that morning and I will always be fired up."