noun
swept-back hair; slicked-back hairstyle
A hairstyle where the hair is combed straight back from the forehead, often with gel or pomade. Wasei-eigo from English 'all back'.
wasei-eigo (Japanese-coined English), from all back
彼はいつもオールバックにしている。
He always wears his hair slicked back.
オールバックはビジネスシーンでもよく見られる髪型だ。
The swept-back hairstyle is also commonly seen in business settings.