It's father!
4 seconds sound clip from the Bill & Ted's Excellent Adventure movie soundboard.
You can hear this line at 00:37:27 in the Blu-ray version of the movie.
Quote context
[...]
- Oh, you beautiful babes from England, for whom we have traveled through time.
- Will you go to the prom with us in San Dimas?
- We will have a most triumphant time.
- Joanna!
- We're to be married to horrible old men today.
[...]