someone who is generally a bit sneaky; a snitch, snake, filthy cunt
this person will most likely ditch you at a shit party, steal your drugs and/or alcohol, sweet talk your girlfriend or hog the joint
can be applied in jest to mates
"Oi D'arcy left the band cos we were too heavy for him and then he went on our myspace and fucked it all up and deleted our songs and told hot girls we were gay... what a filthy fucking scrim rad!"

"Hey quit snaking the cone piece you scrim rad"
by declanisromped April 22, 2008
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