Yes it's physically possible, I've seen a video of a guy actually shoving his whole head up there up to his ear loop

 

Ahhh, the perfect girl to bring home to mom.

 

Took a Brit to sort that out for y`all!!.
Here`s something a little less subtle from England
.....best appreciated north of the Mason-Dixon line!.

How do you circumcise a Redneck?.

.....Kick his sister in the back of the head!.