Someone who is crazy.
The cuckoo clock itself.
The sound of that particular bird.
A person who inveigles themselves into a place where they should not be (used especially in the phrase a cuckoo in the nest).
Any of various birds, of the family Cuculidae, famous for laying its eggs in the nests of other species; but especially a common cuckoo (Cuculus canorus), that has a characteristic two-note call.
The bird-shaped figure found in cuckoo clocks.
Crazy; not sane.
To make the call of a cuckoo.
To repeat something incessantly.
A male fan who is obsessive about a particular subject (especially, something or someone in popular entertainment media).
To worship, support, drool over the object of affection; to be a fanboy.