1 definition by mk 2 jag

Top Definition
Acronym standing for "Chuckling Amusingly To One's Self".

Used primarily in text language when replying to a joke that is not funny enough to warrant 'laugh out loud' but makes you smile or chuckle to yourself.
laughter
LOL
chuckle

text
person 1 txt: man walks into a bar....ouch
person 2 replies: CATOS :o)
by mk 2 jag September 06, 2011

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