ぎゅうぎゅう詰づめ

noun which may take the genitive case particle 'no', na-adjective

jam-packed; packed like sardines

Describes a space, container, or schedule that is extremely crowded or tightly filled, often uncomfortably so. Used both literally and figuratively.

• 朝あさの通つう勤きん電でん車しゃはぎゅうぎゅう詰づめだ。

  The morning commuter train is jam-packed.

• スーツケースに服ふくをぎゅうぎゅう詰づめにした。

  I packed my clothes tightly into the suitcase.