The word 'messily-torn' is a compound formed from 'messily' (adverb form of 'messy', meaning 'in a messy way') and 'torn' (past participle of 'tear', meaning 'to rip or split').

'Messily' comes from 'messy', which originated from the noun 'mess' (Middle English, from Old French 'mes', meaning 'portion of food'), and 'torn' is the past participle of 'tear', from Old English 'teran'. The compound 'messily-torn' is a modern English formation.

Initially, 'messily' meant 'in a messy way' and 'torn' meant 'ripped'. The compound now specifically describes something that has been ripped in a disorderly or untidy manner.