Cannabis. In particular, hashish (as it is sticky). Popularised by certain death metal bands, including Burning Skies in their song 'Sticky Richard'.
'ere mate, you got any sticky Richard?
If anyone's got a bit o' the ol' sticky Richard on 'em, come see us after the gig ;)
#Sticky Richard born and bred
In the hearts of those who want their eyes red
Play some metal, smoke some green
No weak shit in between#