He handed me a Big A mac a sandwhich

The story:

Acutual it was a friend of mine with whom I worked.
She came to work laughging one morning and I aksed her what was so funny. Her brother drove her to work that morning and the song Down Under was playing on the radio. She said her brother was singing it, and thought they were saying ( He handed me a big a mac a sandwich ) She said she couldn't stop laughing.