Robert was very upset, yes.
4 seconds sound clip from the Step Brothers (2008) movie soundboard.
You can hear this line at 00:48:59 in the Blu-ray version of the movie.
Quote context
[...]
- That's what we talked about. We'll take the long way home.
- Is my dad mad about the stuff that happened?
- He knows that you interviewed as a team.
- And he heard about the fart.
- Yeah.
- You just couldn't hold it, or you...?
- No. I thought it was gonna be silent.
- Just kept going, and it made a sound. It was embarrassing.
[...]