Jewishish
Someone who isn't jewish but acts jewish, has jewish friends, and considers themself jewish.
"Did you see Mordechai's girlfriend? Would his parents be ok with her not being jewish?" -guy #1
"She's jewishish so his parents say its ok as long as they don't get married." -guy #2
"She's jewishish so his parents say its ok as long as they don't get married." -guy #2