Bone-Deep Meaning

(idiomatic) Extremely deep or profound (emotionally)

Example: 26 June 2014, A.A Dowd, AV Club Paul Rudd and Amy Poehler spoof rom-com clichés in They Came Together[1]
  Parody, in its purest form, is an act of both mockery and appreciation. True masters of the practice possess a bone-deep understanding of their targets; they skewer because they love—or at least, because they’ve done their homework.