GAFM is a shortened word for "Get away from me", it is commonly used by teenagers, specifically girls.
<Mary> Hi, who are you?
<perv> Well hello Marry, it is I, your wildest dreams
<Mary> what the? Do I even know you?
<perv> *gets near her*
<Mary> GAFM!!!!! *runs*
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"My GAFM reads terribly low."
"Let's see if you yelling at me will cause a spike in my GAFM..."