He means "finesse" (with an "ing" added to the end) which means tweaking out the imperfections to make it one clean, cohesive piece of work
interesting.. that could also make sense.. but he still spelled it to odd for us to really know! thought finesse-ing looks like it it closer to the spelling
she needs to come back and slay all the radios like she did before.. 
I wanna meet her
