Memejacker

Someone who constantly posts memes on social media sites

The over use of memes as comments would bring a person to be called a memejacker

Memejacker by brashdragger August 8, 2015

Mealjacker 

Someone who joins one or more people in a public eating area, who is not invited or welcome, and immediately wrecks whatever conversation, vibe or mood that was occuring, often with their mere presence. A mealjacker normally has no idea he is jacking someone's meal; he normally believes that the person or group actually wants him to be there. This common misconception is often predicated on polite small talk and the social norm of not being able to actually tell someone to sit somewhere else. Closely related to the cock blocker, the meal jacker strikes only during meals, when his victims are most vulnerable and least able to flee. But her powers of social extinguishment are not limited to potential romantic interaction; the mealjacker virtually shuts down all social conversation.

You're at the dining hall, eating the slop and generally having a good time with a couple friends, when you spot "Jeffery" or "Margaret" coming toward you carrying a tray. Your stomach drops. You let loose with an inner wail and scream "Nooooo" inside your head. But much like when you see the cop on the side of the road, it is too late to do anything about it now. You brace yourself, whisper-shout to your friend "Mealjacker!" and grit your teeth, because you are about to be mealjacked.
Mealjackings often occur in college dining halls and high school cafeterias, but can occur in any open eatery with general seating. The jackees often feel violated and helpless, especially in a booth setting, with little or no means of escape. See also close talker and cock blocker

Mealjacker by David Bolen September 22, 2008

Memejacked 

Sending or referring to a meme before your colleague does.

Italian Bearded Hooded Guy: "Oh man this situation reminds me of t-..."
Francospanish Bearded Guy: "It's like the meme song Run from Awolnation!"
Italian Bearded Hooded Guy: "Damn... Memejacked by this handsome Francospanish Bearded Guy again..."

Memejacked by Francospanish Bearded Guy March 11, 2020