learned from speed tv: Clag is the bits of rubber that get thrown off the tires to the side of the road outside the racing-line.
I have walked the track after a race, and they are often small specks to marble sized, and less-frequently but noticable golf-ball sized.
by Matthew May 23, 2004

by busmas April 22, 2003

Clag can also refer to any smoke or byproduct of a large diesel engine's Starting or pulling heavy loads as seen with trains and semi's
During Locomotive starts, there's excessive clag
by Northstar2007 November 06, 2007

An aviation acronym that originated within the Royal Air Force. It stands for "Cloud Low, Aircraft Grounded", but nowadays it is often used in general usage to describe grey, drizzly low laying cloud.
by Ben Chapman January 17, 2007

Brand of Australian glue, often used in a sentence to describe something that has become stuck or stopped up.
by erin day May 30, 2005

a mix of the words "cunt" and "slag" = clag. it can be used as a joke towards friends or siblings, but if used in a serious context it would most likely come off weird.
by stantwice555 December 04, 2022

by David Palmer May 30, 2005
