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1.
A half-spliff, half joint. Typically rolled in a large paper, to allow for each half to be savored as a unique experience.
Does this have tobacco in it?

Nah, the first half is just weed. It's a spliff-joint.
by VC-MUNX May 12, 2011
 
2.
an area of land in maynooth, ireland. popular for under age drinking

a group af teenagers called the SJ crew hang out there

the spliff joint is also called the SJ
"here man where you drinking tonight?"
"spliff joint probably.."

"right i'll see down the SJ"
by A nagan and three March 30, 2008