but yo-yo it's also a toy (I think in English it's called the same) so, someone that is a yo-yo can mean that it is a person that can be easily manipulated like a yo-yo or a person that changes humor or personality or ideas, very frequently. Also can be referd as a person, that comes and goes, easily (like in and out of relationships)
Malathion is an insecticide in the chemical family known as organophosphates. Products containing malathion are used outdoors to control a wide variety of insects in agricultural settings and around people's homes. Malathion has also been used in public health mosquito control and fruit fly eradication programs. Malathion may also be found in some special shampoos for treating lice.
Spectracide Malathion Insect Spray Concentrate. Spectracide Malathion Insect Spray Concentrate is formulated to protect outdoor plants such as flowers, shrubs, fruits and vegetables from listed leaf-eating insects. Use to control insects in and around the garden. Protects listed flowers, fruits and vegetables from listed leaf-eating insects.