I learnt BSL (British Sign Language) with my then girlfriend whilst at uni. We used it to chat in the library, talk to each other across the room anywhere it was too busy or inappropriate to shout - very useful.
Given the access to information nowadays i imagine people would be more likely to learn an established sign language due to its wider use. That said we developed our own simplified signs for BSL to communicate with our babies, which quickly became adapted by them, so even this way I feel slangs would develop readily.
Given the access to information nowadays i imagine people would be more likely to learn an established sign language due to its wider use. That said we developed our own simplified signs for BSL to communicate with our babies, which quickly became adapted by them, so even this way I feel slangs would develop readily.