noun
boomerang
Refers to the curved throwing tool that returns to the thrower, or metaphorically to something that comes back to the originator.
オーストラリアのお土産にブーメランを買った。
I bought a boomerang as a souvenir from Australia.
彼の批判はブーメランのように自分に返ってきた。
His criticism came back to him like a boomerang.
noun
swim briefs; Speedos
Slang abbreviation of ブーメランパンツ, referring to tight men's swimwear. Casual and somewhat humorous.
See also: ブーメランパンツ
海でブーメランを履いている人を見かけた。
I saw someone wearing Speedos at the beach.