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3.
A combination of the words ‘slag’ and ‘baggage’.

1. A disparaging description of a bitchy girlfriend who is giving her boyfriend constant shit over an extended period of time.
2. A genderless description of a difficult or obstinate individual that is impeding another's advancement.
Imran - No room for excess slaggage on this flight, bitch! Welcome to dumpsville - population: you!
by richiebabe24 September 01, 2008
 
1.
A large slag seen to be radiating slag waves.
That girl is some serious slaggage.
by Leggiedan October 11, 2007
 
2.
friend of the female you are trying to have sexual relations with that continually infringes upon your advancement attempts of a sexual nature.
After targeting a potential slag at the local bar I began to make advancements in order to get woo this unexpecting young lady, after feeling I had done my do diligence I decided it was time to close the deal and bring her home only for her slaggage to deny my attempts each time.
by Slag Slammer December 09, 2010