What slang word from the 1980s does Marty say several times in the first movie that causes Doc to say "there's the word again!"

At the scene where Doc and Marty go back to George McFly's high school, Marty refers to something as "heavy," to which Doc replies: "There's that word again: 'heavy'. Why are things so heavy in the future? Is there a problem with the earth's gravitational pull?"

Asked by Tom Cohen · Last updated 5 years ago · 6.7K views