adjective
[ not usually before noun ] jam-packed (with sb/sth) ( informal ) very full or crowded :
The train was jam-packed with commuters.
adjective
[ not usually before noun ] jam-packed (with sb/sth) ( informal ) very full or crowded :
The train was jam-packed with commuters.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005