Meaning of anywhen in English:

anywhen

Pronunciation /ˈɛnɪwɛn/

adverb

non standard, dialect, humorous British
  • At any time; ever; = "anytime".

    Frequently paired with or as a (playful) parallel to "anywhere".

Origin

Mid 19th century; earliest use found in Thomas Carlyle (1795–1881), author, biographer, and historian. From any + when.