Sentence:  Incels are mostly losers who don't get laid — involuntarily celibate. Basically it's a giant pity party that started on the 4chan board R9K. R9K is a board on 4chan where inceldom started. They have their own terms and stuff like that. For example if you're over 30 and still a virgin they call you a "<WSD>Wizard</WSD>." 
Meaning of the word marked with <WSD> tags:  An adult virgin over the age of 30