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.
Malathion is pediculicidal (kills live lice) and partially ovicidal (kills some lice eggs). A second treatment is recommended if live lice still are present 7â9 days after treatment. Malathion is intended for use on persons 6 years of age and older. Malathion can be irritating to the skin. Have the infested person put on clean clothing after treatment. 2  If a few live lice are still found 8â12 hours after treatment, but are moving more slowly than before, do not retreat. 3  The medicine may take longer to kill all the lice. 4  Comb dead and any remaining live lice out of the hair using a fineâtoothed nit comb.