Not really sure what you are describing.
Basically if you are going behind your leg it is a tail grab as long as it is behind the heel piece. Outside edge is called toxic, but no one uses that name anymore. Pretty much blunt,toxic and tail are just called tail grab these days because they are so similar.
Now if you are reaching around the front your shin, that is an inside saftey, you could technically go back behind your binding but eventually your balls are gonna get in the way.
naming grabs was sooo 2002 though. lol. Actually seriously though back then kids would argue for hours over the name of a trick or grab. Now days as long as it looks cool it doesn't really matter. We have lost so many grab names to history.