You can do something like this:
{ "keys": "ctrl+k","o","o","s"], "command": "insert_snippet", "args": {"contents": "currently out of stock"}}
once you pressed the ctrl+k just type “oos” to print the contents at cursor location…
or
{"keys": "ctrl+shift+o","ctrl+shift+o","ctrl+shift+s"], "command": "insert_snippet", "args": {"contents": "currently out of stock"}}
in this case you have to type “oos” while pressing ctrl+shift…
just add it to your User Key Bindings file…
You could also do something like
{ "keys": "o","o","s"], "command": "insert_snippet", "args": {"contents": "currently out of stock"}}
but it will trigger every time you type the “oos” key sequence so it will trigger also when typing words like “boost”, that’s why the other suggestions include ctrl or shift keys.
hope it helps