A very annoying individual who is a mixture of things. (i.e they are a slag and a bastard)So abreviated they become a slagbast. Trust me on this one there are plenty slagbasts out there! So before u dis the word just think about it bcus u are bound to know some slagbasts!
random guy: OI SlAgBaSt NOOOOOO!
stranger:say wat dude?
random guy: u are a slagbast!