To use ones meatwand to remove the teeth of an unsavory member of society with a hammer likemotion.
Corey notices another recruit in the squadbay whos teeth are missing. The all knowing guide informs him that the cause is simple...a recruit tied him down and "matlocked" him with his hoohoo.
When some resigns or retires from a job, they are on "eternity leave". This can also refer to someone who has passed away, especially someone who worked somewhere for a long time, retired/resigned, then passed away later.
Oh I'm sorry, you didn't know that Kelly is on eternity leave? She resigned and moved to Hawaii!
With regrets I would like to inform you that my boss is officially on eternity leave. I will never see or hear them again. Ever.