internet acronym for "silently chuckling at keyboard".
Person 1: that's such a funny joke lol
Person 2: i know eh? scak
Person 1: SCAK IS NEVER GOING TO CATCH ON!
Person 2: it will now that it's on urban dictionary :) scak
A term used to describe any form of smegma or other foul crusty substance produced by the human body. Usually found in crevasses or folds of skin due to the fact of bad hygiene.
Hey man...you got some scak on the corner of your mouth.