Gren from the Urban Dictionary and Google searches

1. Gren
Alcoholic wife beater loser. Lives with mother slapper. No real mates gay.
That's gren lad, have pity.

2. Gren
Meaning "Weed".
i.e short for "Green"
Mostly used in the South East of England (e.g Bournemouth/Southampton)
"Bruv anyone got any gren at the mo?"
"Nah everyone's dry, but there's some block going about I think"

Unbeknownst to me, I am a social outcast, a slang word for an illicit drug, a deceased cartoonist, an association of independent musicians who share common interests in Classical, Russian, Israeli and Klezmer music, a Windows 9x/2000 renaming utility and an automotive parts manufacturer of auto brake rotors, drums, pads, radiators and wiper blades.

Hardeeharhar! Who knew!

I feel so...so SPECIAL!!!