Much like a jack mormon who sometimes engages in drinking alcohol, caffeine and even premarital sex - much to the disapproval of the Church of Jesus Christ of Latter Day Saints - a jackvegan is a vegan who every now and then cheats on his or her veganism by consuming dairy products such as cheese.
Joslyn: Oh no we can't go there! I'm vegan so there's nothing for me to eat at that murder and animal torture factory!!
Tony: Bullshit you're a vegan Joslyn! I saw you crush a slice of cheese pizza after we got out the club the other night. You may eat way less dairy than my vegetarian ass but you're like a jack vegan if anything.
Insanely racist, cannot stand any member of any other races. He does however have an incredibly massive cock, and drops the freshest memes anyone on the planet has ever witnessed in their lives. If burning people at the stake were a career, he would be a professional. Every single girl on the planet gets absolutely drenched whenever they hear, see, or smell the presence of Jack Peevers anywhere near them.
"Oh my God! I just got the hardest pounding ever by Jack Peevers!! I won't be able to walk properly for months!"
"Woah, do you see that?! He's wearing four pairs of jeans but I can still see Jack's massive cock imprint!"
A person who has the qualities of a Jack, and was given the birthname john. a jack/john has the sexiest eyes, and if you make him mad, he will destroy you verbally. he is amazingly smart and is truly the shit