Kevin is Jawn from the band Waterparks dog, and a lot of the Waterparks fanbase decided to set their profile picture to the same image and set their Display Names (DN's) to 'kevin'. This was known as the Kevin Takeover. The fans who participated in using the hashtag 'KevinNationArmy' did this so that other Kevins could see their tweets. This started off as unproblematic but the 'big parxies' decided to hate on them for it and cancel the kevins.
R.I.P kevin takeover.
big parxie: "This is really problematic. You're giving people anxiety and it's really annoying and childish."
kevin #1: "It's literally a dog."
kevin #2,3,4,5.. etc: "kevin."
or
twitter user 1: "whos kevin?"
kevin cult: "kevin"
twitter user 2: "it's Jawn's dog. people are using the profile picture and dn to have fun but the big parxies have a problem with that."
or
twitter user: "whats kevin takeover?"
a kevin trying to recruit new kevins: "we are going to try and take over stan twitter by using the hashtag '#KevinNationArmy'. Join us, we have cookies."