Aleksey, that is the name I was trying to remember from Judo - hiji kime. Iow the stripped down version of Wakigatame which is simply a lock on the extended elbow joint.
Wakigatame gives one a few more options and is a bit more giving if one does not want to snap the elbow. And yes it has worked for me in non dojo settings as well.
Peter, I've been told that Waki is one of those techs that are impossible to counter once it's on. What do you think?