a ligfragg is (little green man that works for the fraggle's)
when someone is such a muppet just calling them a fraggle wont cut the mustard so you call them a ligfragg someone even below the fraggles.
dude your not even a fraggle your a ligfragg you need to sort your self out.
man did you see tuck being sick in the pub lastnight? wot a ligfragg