Definition & Meaning of "fank you"in English

What is the origin of the term "fank you" and how is it used?

Fank you is a slang expression that appeared in late 20th–early 21st-century English as a sarcastic or mocking way to say "thanks." The spelling changes the usual "thank" to "fank" to signal irony, annoyance, or contempt, so the speaker is technically saying thanks but actually showing frustration or displeasure. Historically and today, it is informal and mocking, used in speech or online to express irritation, disbelief, or passive-aggressive humor rather than genuine gratitude.