noun
circular bento box
A traditional round wooden lunch box, often used for carrying rice and side dishes.
祖母はわっぱにご飯を詰めてくれた。
My grandmother packed rice into a circular bento box for me.
noun
something ring-shaped
Colloquial; refers to any ring-shaped object, often used in casual conversation.
このわっぱ、何に使うの？
What do you use this ring-shaped thing for?
noun
Colloquial term for handcuffs, often used in the phrase ワッパをかける (to handcuff someone).
警察は容疑者にワッパをかけた。
The police put handcuffs on the suspect.
The origin is uncertain. It may be related to 輪 (わ, ring) with a suffix, but the exact derivation is unclear.