That phrase likely refers to the process of installing Flipnote Studio on a hacked Nintendo 3DS or 2DS using a .cia file (the standard format for 3DS homebrew installers).
CIA File Structure The CIA file format consists of several sections: flipnote studio dsi cia work
Creating Flipnotes: Users start by creating a new flipnote, drawing each frame on a series of "notes." The DSi's touchscreen makes drawing straightforward, albeit with some limitations due to the screen's resolution. That phrase likely refers to the process of
NDSForwarder (from Universal-DB) or TWiLight Menu++ forwarder generator.sd:/luma/dsibios/.