Fitn on- To do something, getting ready to get involved in, in the prosess of doing , have been involved in.
Comes from the southern word: Fixn- fixn to go get sum popeyes, fixn to go cash my check, fixn to take out the trash.
Marc: What you getn into 2nite nagle?
Alex: Ima be "fitn on" wit Tone and Dale, you down?
Marc: Yeah Im down to "fit on"