Anagrams are an extremely popular form of literary device wherein the writer jumbles up parts of the word to create a new word. From the syllables of a phrase to the individual letters of a word, any fraction can be jumbled to create a new form. Anagram is a form of wordplay that allows the writer to infuse mystery and a little interactive fun in the writing so that the reader can decipher the actual word on their own and discover a depth of meaning to the writing.
An anagram for “debit card” is “bad credit”. As you can see, both phrases use the same letters. By mixing the letters a bit of humor is created.