Top Definition
The period between Christmas day 2009 and New Years day 2010 where many members of the public turned into the Master from Doctor Who.
Masteritis has spread like wildfire on many popular internet sites.
by MrsMazzyTennant January 01, 2010
Master bating while looking at a hot person
"Dude! I got a case of Masteritis when Alexa walked past me, she's so hot!"
by jacubzbro06 February 27, 2015
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