a masterbathon is a day that you stay home from school "sick" so you can beat off so many times that you are dry and chaffed and can't walk so the next day you have to stay home and do it all over again
Mike: "Damn jimmyhas been out of school all week"
Steve: "I konw he must be having a masterbathon"
Someone that hates people who masterbate or purposely blocks them from doing so by stealing their porn or not allowing them to download, buy, or view any.
Mother: You shouldn't be readingPlayboy!!!
Son: You masterhater!!!