Fabetha
To be so Fab that you can't even. Fabetha can be used as an adjective or a noun. A play on words concerning the meaning of the name Tabetha (as seen on Urban Dictionary). Tabetha is normally seen as a generally awesome person, or a fabulous person. Thus creating the play on words Fabetha.
She's so Fabetha that I can't even! She's so great, she must be a Fabetha! Our friend was so amazingly fabulous that we nicknamed her the Fabetha of the school.