A British three peice mod revival band from the 70's and 80's.

Because Jimin is very no fun.

Bascially mening "no-fun" (no sense of humor). Jam (or Jaem) it's short for the korean word "jaemisso" which means fun, combined with the english "no".

Popularised internationally by BTS in a video clip where RM tells Jimin he has "no-jaems" - Where it sounds like the english word "jams".

Used to describe anything that is awesome.

Used similarly to "it's the shit."

To jam is play jazz on a musical instrument such as the saxophone; or to rock out to your favourite music artist by yourself or with others.

One of the defining bands of the late 70's / early 80's,

members included: Paul Weller , Bruce Foxton and Rick Buckler
Ultimately legendary!

A jam is usually another way of saying "party" primarily used by teenagers.