If somone is GDH they are often paranoid and bald. However if somone is a complete bam/ned and lives in a housing estate they can be refered to as GDH.
A remark often made by a witness or someone involved in a conversation where most involved are young(er) or the subject is one usually explored by high schoolers, seemingly pointless and slightly irritating
"so anyway, then bla bla bla random teenager crap"