Snuffkin
When a girl is sitting on the toilet taking a dump, and the guy eats her out. So called "Snuffkin" because he has to get his head actually in the toilet.
Near Snuffkin Experience
When one performs the act of Blumpkin, nearly dies, has to be resuscitated and survives, living to tell the tale.
Example:
Granddad: Hey did I ever tell you kids about my Near Snuffkin Experience?
Grandchild: No, please do go on.
Granddad: Hey did I ever tell you kids about my Near Snuffkin Experience?
Grandchild: No, please do go on.