"Swack" does NOT mean, "fuck"! There may be a few idiots in San Diego who have usurped the word and changed the meaning to suit themselves, but that is not the general definition.
Example: "Half-Swacked" was a word used in the midwest often to described a person who was nearly totally DRUNK! If a person was totally drunk, he was described as "swacked".
"I saw Johnny come around the corner on one wheel, which told me instantly he was either half-swacked, or was nearly swacked."
"I don't want to go out tonight, sweetheart, just to sit around that damned bar and get half-swacked!" (The wife has spoken!)