When a fat woman faints on top of you during sex, and you suffocate either in boob or armpit.
A: Did you see what they put on Tod's tombstone? B: No what did they put? A: Poor bastard died of a potato pancake may he live for ever in his pleasure of obesity.
When a woman with a flabby ass presses it into your face. This could be done to anally motorboat, perform analingus or cunnilingus. Can be used in both a positive and negative sense.
"How did things with that girl go last night?"
1) "They went well until she gave me the ass potato pancake"
or
2) "It was pretty dull until she gave me the ass potato pancake...then it was awesome!"