on the prowl
(idiomatic) Hunting or seeking; prowling about.
The cat was always on the prowl for bit of string or a dangling shoelace.
We live in a culture where everything is designed for our comfort or entertainment but nothing satisfies. At our core, we remain insatiable, constantly on the prowl for new commodities and pleasant sensations to fill the void. Daniel Pinchbeck
Mothers, lock up your daughters, then lock up your maidservants, then lock up yourselves. Lord Montgomery is on the prowl. Cassandra Clare
Lana Del Rey seems to be bothering everybody because she allegedly remade herself from a folk singing, girl-next-door type into an electro-urban kitty cat on the prowl (of course I like her), and they feel she is inauthentic. Liz Phair