The most common response to "capiche" is simply "Yes" or "Got it", confirming that you understand.
Here are some other ways you could respond:
* "Yeah, capiche." - This echoes the speaker's slang and implies you understand.
* "I got you." - A casual, informal way to acknowledge you understand.
* "Roger that." - A playful, more formal response, often used in a military context.
* "Gotcha." - Another informal way to say you understand.
The best way to respond depends on the context and your relationship with the speaker.