"to human: yes" is a way to say that you agree with someone. Normally you would replace "human" with the actual name of the BotBr you're agreeing with.
It's an inside joke based on '[l[https://battleofthebits.com/arena/Entry/MY+SONG/28612/#post101252[this comment] by jaemie.

'[#[notable battles]
- '[l[https://battleofthebits.com/arena/OHC/3875/[To human] hosted by '[l[https://battleofthebits.com/barracks/Profile/Robyn/[Robyn]

'[#[notable entries]
- '[l[https://battleofthebits.com/arena/Entry/also+yes/30441/[also yes] by '[l[https://battleofthebits.com/barracks/Profile/Robyn/[Robyn] and '[l[https://battleofthebits.com/barracks/Profile/djmaximum/[djmaximum]