Being quick and efficient at doing tasks — a fast worker who finishes jobs promptly.
彼女は手が早いので、発送作業はいつも彼女に任せている。
She's quick at her work, so I always put her in charge of shipping tasks.
手が早い職人は少ない時間で多くの注文をこなせる。
Skilled, fast workers can handle many orders in a short time.
Quick to form sexual/romantic relationships — used to imply someone is sexually forward or promiscuous.
彼は合コンで手が早いと評判で、何人かから注意されている。
He's got a reputation for being forward at mixers, and several people have warned him.
新しい出会いの場では、手が早い人には気をつけたほうがいい。
At new social gatherings, it's best to be careful of people who are too forward.
Quick to resort to violence — someone who tends to become physical or strike first in fights.
彼は口論になると手が早いので、近づかないほうがいい。
He tends to get physical during arguments, so it's better not to get close to him.
酔うと手が早くなる同僚がいて、トラブルが絶えない。
A colleague becomes violent when drunk, and trouble never ends.