A Jack is an absolute dickhead. He thinks he is always right, when he isn’t. However, he makes an alright friend, because of his sense of dark humour.
Jack, that’s illegal
by Scoobitywhapbap April 30, 2020
Get the Jackmug. 
by Godisdogspeltbackwards August 11, 2018
Get the Jackmug. A boy that humps other boys on a regular basis. Jack also rapes Cats, Dogs and other household pets.
Get off of me Jack
by spacelime June 13, 2017
Get the Jackmug. Jacks tend to be very stuck up. They think they are higher than anyone else and are very vindictive people, as long as they're happy they don't care about anything else. Also jacks seem to be gold diggers and also like to flash there cash when they have some. Jacks are compulsive liars with out realisation and they loveeeee them self way too much and people don't find that attractive at all. Lastly jacks don't tend to take rejection very well.
by tom.is.a.prick February 28, 2017
Get the Jackmug. A guy who is a totally obsessive Virgin who will stop at nothing for a girl to touch him. Be careful, if you start to talk to him it's hard to get away from his latch.
by Sassy Sally October 1, 2015
Get the Jackmug.