This is the 625th most frequent Japanese word.
デカ
"デカ" is Japanese slang for "detective."
Here, 'デカい' is used as an adjective meaning 'big' or 'huge,' describing the size of the hamburger.
その店のハンバーガーは本当にデカいですね。
The hamburger from that store is really huge.
In this sentence, 'デカ' is used as a colloquial noun meaning 'detective,' referring to a person's occupation.
あの人は昔、優秀なデカだったそうです。
It is said that person was an excellent detective in the past.
Here, 'デカい' is used to describe the intensity or volume of someone's voice, showing its versatility in applications.