What does milph or milf mean?

My 14 year old son and his friends say this word around the house but they don't know I can hear them. I am not sure on the spelling either. Is this slang for drugs or curse words?! I am not sure if I should punish him for using this kind of language or if it is just one of those words that kids say that is... show more My 14 year old son and his friends say this word around the house but they don't know I can hear them. I am not sure on the spelling either. Is this slang for drugs or curse words?! I am not sure if I should punish him for using this kind of language or if it is just one of those words that kids say that is just a trend. Should I be concerned that he is experimenting with drugs? If so what kind of drug is milph. Possibly meth?

I am a nervous wreck, PLEASE HELP!
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