'barfy' originates from English, specifically the word 'barf' with the suffix '-y', where 'barf' meant 'to vomit'.

'barf' is an American English slang term dating from the early 20th century, likely onomatopoeic; adding the adjectival suffix '-y' produced the modern informal adjective 'barfy'.

Initially, it meant 'to vomit', but over time it evolved into its current adjectival meaning of 'causing nausea' or 'feeling sick' and the informal sense 'disgusting'.