Question What are bumps?

[Astro-Girl]

A short, but fairly self-explanatory question here lol. What are bumps? I always see them on roleplay requests but honestly I have no idea what they are, what they mean or how to do them! If anyone could clarify this then that'd be really appreciated!

 

[Praxis]

This link contains that answer and many more useful bits of information about BMR.