Are you sure?
3 seconds sound clip from the Space Jam movie soundboard.
You can hear this line at 01:11:43 in the Blu-ray version of the movie.
Quote context
[...]
- You go on ahead and celebrate with your team mates...
- I'd like to, but I have to ice down my knees right away, okay? They're starting to go.
- Yes. Definitely sure. Definitely.
- Losers.
[...]