Deriving from a gaelic word for 20 "scór",
a scorebag refers to a bag of weed worth 20 euro/punt.
It may also be used in a variety of ways as an insult (generally for a male) ie. someone who is cheap, someone who takes drugs ( a junkie ), someone of low socio-economic status , a bogie and more ..
A person who sucks cock rubs his balls in his mothers face while jerking off a dogs tale while doing the monster mash in the shower picturing Kango Testicles