Lingo (noun)

1. A particular language or dialect.
2. The specialized vocabulary and terminology of a particular field or profession.

Origin:

1670s, from spanish lenguaje "language," from latin lingua "tongue, speech, language".

Examples:

1. He speaks the lingo fluently.
2. It takes time to learn the lingo of the trade.
3. The lingo of the street is different from standard English.
4. The computer lingo is hard to understand for non-experts.
5. The lingo of the financial world is full of jargon and acronyms.