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1.
An acronym meaning: "Genuinely let out a little chuckle" which may be used to express this in written form.

It can however only be used if you did ACTUALLY let out a little chuckle out loud and not in any other circumstance.

It is not a replacement for such acronyms as: "lol" "lmao" and "rofl"

Ref: Piers.
On Facebook chat:

Peter: -tells joke-

Sophie: Gloalc
by TheCreatorMarkII April 22, 2012