gyuu-gyuu
Describes something squeezed or packed so tightly there's no room left. Often used for crowded trains or overstuffed bags.
💡On a rush-hour train — 'The train is gyuu-gyuu packed!'
満員電車でぎゅうぎゅうに押された。
I was squeezed gyuu-gyuu on the packed train.
The suitcase was ___ with souvenirs from the trip.
スーツケースがお土産で○○に詰まっている。