Top Definition
A laptop used solely for the purpose of checking facebook. All it needs is a folder for pictures and internet explorer/firefox.

A person will see a laptop around, and identify it as a 'portable facebook machine'

Often times, people who are facebook whores sit together and use their portable facebook machines and stalk the same cute person of the opposite gender.
Chris: yo let me use your portable facebook machine!!
Shyam: my what?
Chris: your laptop!
Shyam: whatever queer
by g-diggity November 04, 2007
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