BUR #6311 has been approved by @evazion.
create alias balls_deep -> deep_penetration
The common way to refer to this is "balls deep". "deep penetration" has the issue that it could be misunderstood to be cervical_penetration.
We recently changed prodding into just the tip, so might as well do this too. Otherwise if people think it's too ambiguous I'm fine with just adding balls_deep as an utility alias, though I can't see anyone misunderstanding it for something else.
Edit: nevermind, reversed because I don't want people to accidentally use this tag for deepthroat or fall into a dumb argument about ball-less futanari.