'Jigging'
I discovered masturbation at a pretty young age, significantly pre-puberty. As you can't really get a lob-on at that age many of the distinguishing characteristics of a good shuffle are absent, all I knew is that applying pressure rhythmically caused a good feeling. The corners of chairs were particularly useful for this.

I was caught a few times, but it was not sufficiently explained to 7-year-old me that it isn't the kind of thing one does in polite company. Until, after a particularly vigorous session that my gran walked in on, my parents took me to the doctor's to make sure I hadn't damaged my cock.
( Ungersven would support SpankyHanky's patreon, Sun 6 Jun 2010, 12:53, Reply)