instant yakisoba in a cup
Refers to a specific convenience food: instant fried noodles in a cup, similar to cup ramen but with yakisoba-style sauce.
See also: 焼きそば
I bought an instant yakisoba cup at the convenience store.
Pour hot water into the instant yakisoba cup and wait 3 minutes.
Compound of カップ (cup) + 焼きそば (yakisoba). A straightforward modern product name.