There's that word again. Heavy.
4 seconds sound clip from the Back to the Future movie soundboard.
You can hear this line at 00:57:59 in the Blu-ray version of the movie.
Quote context
[...]
- Apparently, your mother is amorously infatuated with you, instead of your father.
- Are you trying to tell me that my mother has got the hots for me?
- There's that word again. Heavy.
- Why are things so heavy in the future? Is there a problem with the Earth's gravitational pull?
- What?
- The only way we're going to get those two to successfully mate is if they're alone together,
- So you've got to get your father and mother to interact in some sort of social...
- Right!
[...]