"The foks at table nine are really getting on my last nerve."
When appropriate, use foks in place of folks, but make it subtle.
Example: You are a hostess at a restaurant. In walks a couple. You proceed to say "Hi folks, table for two?" However, if that same couple has an attitude problem or is in anyway rude, make it sound more like "Hi fucks" simply by stating "Hi foks, table for two?" They will never pick up on the subtly but as the same time you will reap the satisfaction of knowing you just insulted them.