The little one behind you is Mouse.
4 seconds sound clip from the The Matrix movie soundboard.
You can hear this line at 00:38:37 in the Blu-ray version of the movie.
Quote context
[...]
- This is the core... where we broadcast our pirate signal and hack into the Matrix.
- Most of my crew you already know.
- This is Apoc, Switch, and Cypher.
- Hi.
- The ones you don't know: Tank and his big brother, Dozer.
- The little one behind you is Mouse.
- You wanted to know what the Matrix is, Neo? Trinity.
- This will feel a little weird.
- This is the Construct. It's our loading program.
- We can load anything from clothing to equipment, weapons, training simulations... anything we need.
[...]