I swear I'd already posted in here but search says otherwise...
Ok, me and my girlfriend used to joke about amputated limbs (not in a horrible way), anyone thats seen liar liar, we used to call it "the claw" and many spider like crawling gestures up the other persons back.
Schtumple is a mix of stump, and random inserts of other letters to phonetically mind f**k anyone that reads it into pronouncing it "skumple", I think there was also a long tie in with the podcast "Audiocrush" too, which we both listened to alot at the time.