To the native hawaiians or people who are accustomed to modern hawaiian culture it is a term of great disrepect. In other words, dis dakine word your maddah and faddah give you cracks for cuz you was callin braddah keoni dis when dat faka went jack your slippahs.

when you're hungover as shit after a spending a night drunk as a skunk

like fucker
mostly used in hawaii

Hawaiian slang for Fuckers (English)

Fuh-Kass

Heeey, How ya doin'????
Is basicly what people mean with faka. Also spelled "fawaka" Pretty popular in the Netherlands.