A typo for PMG. Which is a typo for OMG. PMQ doesn't mean anything, really. It's used to mock n33bs and make fun of un-1337 people. Most people use it to make fun of people, and show how dumb they are, by using a degrading acronym such as PMQ.
pmq wai y00 be haxin in mah css server i r ban u nigar pmfq
by Masrad August 10, 2006