Other ways to say 'Yes':
1. By all means: of course; certainly (granting a permission)
2. Very well: used to express agreement or consent.
3. Totally: used to express agreement.
4. You bet: you may be sure; certainly.
5. Definitely: without doubt (used for emphasis).
6. Sure: certainly (used for emphasis).
7. That's right
8. I don't mind if I do: used to accept an invitation.
9. You're on: said by way of accepting a challenge or bet.