The Colorado Department of Revenue-appointed committee added "WTF" -- an abbreviation for "what the" followed by a four-letter euphemism for copulation beginning with "f" -- to bring the total number of three-letter combinations banned by the list to 261, the Rocky Mountain News reported Monday.

Department of Revenue representative Maren Rubino said the committee decides what letter combinations to ban from license plates using "standard common knowledge practices."

"Standard common practices are: any combination of letters or numbers that carry connotations offensive to good taste and decency, are misleading, offensive to the general public, or represent gang, drug, sex, racial terms," Rubino said.

Other combinations banned by the state include KKK, ASS, HEL, FAG, COP, FBI, GAY, JEW, JAP, WOP and CAT.