This is an abbreviation for "just a mustache". It refers to the popular style of past of men sporting "just a mustache" without any other facial hair whatsoever. JAM was popular in many decades before the 1980s, but seems to have gone to the wayside since then. Often, men sport JAM in situations almost as a joke. This term was coined in the 1990s in Sarnia, Ontario and anyone who thinks they coined it before then may have done so concurrently, but not before me.
by simonchuck June 21, 2009
Get the JAMmug. Tito’s and Jameson served chilled. Apparently you don’t go blind when you drink this engine degreaser.
by Got-Jam February 21, 2020
Get the Tit-Jammug. When you fuck a girl so hard in the ass that poo (chocolate), cum (marshmallow) and blood (jam) pour out when your done.
by CG Badman June 19, 2017
Get the Jam wagon-wheelingmug. by PseudoWrestler October 31, 2018
Get the Taco Jammug. A program in New Zealand schools in which children dance along to music together as a group as a sort of exercise routine. Usually done in the mornings.
by Salty_Bitch April 10, 2020
Get the Jump Jammug. by Bsdbdh January 27, 2023
Get the jammed my Glockmug. 