魔改

mógǎi
(slang) to modify in a fantastical way; to modify heavily

CEDICT

slang

Entry Composition

1 魔 mó
  1. (bound form) evil spirit; devil
  2. (prefix) supernatural; magical
2 改 gǎi
  1. to change
  2. to alter
  3. to transform
  4. to correct