A term used to identify your friends that you trust to watch your six. In the military, watching your six means to watch your back. So the people in your 6-click is the select few people that you trust to watch your six.
1. Another way to say “suck my dick”
2. An office sex term. If you want to get laid right there on the desk, walk up to your coworker and say “click clack give my nutsack a slap