[Slang] THAT'S JAM-PACKED. - Grasp Everyday Idioms: Learning About Expressions for Crowdedness

Very crowded.

That’s jam-packed" refers to a place or venue being extremely full or crowded, like how jam is tightly filled in a jar. It conveys a sense of squeezing as much as possible into a space.

Example Sentences

1. The subway was jam-packed during rush hour.

   The subway was extremely crowded during rush hour.

2. Sorry, can't invite you, the party is jam-packed already.

   Sorry, the party is already too crowded to invite more people.

3. I tried to make a quick stop at the store, but it was jam-packed, so I had to leave.

   I tried to make a quick stop at the store, but it was too crowded, so I left.