The same as a Cougar in these states of America, a Kruger too, will prowl the singles bar scene in search of prey..., which is young men. If immigrated to U.S.A., a Kruger can usually be identified by a thick German accent. Hence, the given name, "Greta Garbo Kruger."
Tom: "We've got to leave for the airport now! Where's Bobby"
Foster: "He felt a kruger coming on. He's in the bathroom"