cuckoos

1. a long-tailed, medium-sized bird, typically with a grey or brown back and barred or pale underparts. Many cuckoos lay their eggs in the nests of small songbirds.
2. a mad person.

1. take over (the home of a vulnerable person) in order to establish a base for illegal drug dealing in the area.

   the frightened woman confided to her support worker that her flat had been cuckooed by a gang selling drugs

Middle English: from Old French cucu, imitative of its call.