Argot
/ˈɑːrɡət,ˈɑːrɡəʊ/
Definition 1 of 1
Pro Tip 1/3Group Exclusive
Argot develops within a specific group, like musicians or hackers, and may be incomprehensible to outsiders. 
At the hackers' conference, they spoke in an argot riddled with technical terms.
Pro Tip 2/3Secrecy Purpose
Argot often has a purpose of maintaining secrecy from those outside of the group. 
The spy used argot to discreetly communicate with his contacts.
Pro Tip 3/3Contextual Understanding
Understanding an argot typically requires contextual knowledge of the group's activities and interests. 
Without knowing skateboarding culture, their argot might be confusing.