A German term that originated in the northern regions of Hamburg that refers to erratic and often "trainwreck" style behavior from a middle aged man. A Jan can take on many forms, but often appears in the form of coffee addiction, intern harassment, STD spread, an inflated sense of convenience, and child like aversion to common things such as balloons, rubber bands, cilantro, and condoms.
How was your weekend man? It was pretty wild I pulled a Jan, might have gotten fired, definitely didn't sleep, and now my intern won't return my texts.
by Jewsian Ancestry September 26, 2022
Get the Janmug. Another word for asshole.
by Metulskie November 22, 2021
Get the Janmug. Jan is like a different human species. Cool friend to have. Will always make anything you say sexual and lie about his height.
by irinadalamuie April 23, 2023
Get the Janmug. a rat the is short angry, scared of everything. always makes who asked jokes like who asked for you to be a short lil cunt. short gyal ova here!!!!
by anonymous June 8, 2022
Get the jan - janmug. 
by andreasjones December 29, 2019
Get the Jan-Martensmug. 