Taking the everyday "spazmo" as its base, the "mohican" aspect arises simply because it’s one of the few funny words that begin with “mo”. Fleacon combines the grotbags element of fleas with the heavyweight of spazmos, Joey Deacon himself.
In retrospect, quite a likeable insult.
spasmohican fleacon
written by Jo* B*yth, approved by Log
see also: spasmodeacon