Wiktionary
boys' toys
n. 1 Products such as mechanical and electronic gadgets and gizmos, games, fast cars, motorbikes etc., that are targeted at the adult male consumer who is perceived to have at heart the same fascination with toys as young boys do. 2 Non-consumer products involving high-tech engineering, such as rockets, submarines, helicopters etc., that are likely to interest men.
Usage examples of "boys' toys".
On the desks were boys' toys: aircraft and lunar modules, and models of the new Saturn VB, with solid rocket boosters you could snap on and off.
The ultra-market in the screen, he dialed the children's toy section, boys' toys, and then military-type toys.