Not really either. Conj acts on collections (which can be lists, vectors, sets or hash maps), and adds the second and subsequent arguments to the collection in a type-dependent way. For a list, your hunch is correct, in that it's a bit like a reversed-argument 'cons', except that you can have add more than one item to the list;

e.g. (conj '(:a :b :c) :d :e :f) returns (:f :e :d :a :b :c)