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Graum is Ipswich School slang for a really annoying person with no friends. Especially one who follows you round trying to be funny in the hope you will like them for it.
God he's such a graum.

You fucking graum.
by Johnny Torino November 16, 2006
One who describes/recommends something so overly enthusicastically for so long that you end up hating it.
Graum: You should watch film its like the best thing ever! really! Watch it now! Its amazing!
Me: Yeah, great. SHUT UP!
by Osiris3309 May 07, 2013