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Chuckling Softly To My Self. Generally used as a response to a humerous situation or communication via e-mail or instant messaging. Used especially in the office setting where LOL (Laughing out loud) would rarely be the actual or appropriate response.
A co-worker hears another co worker say something innocently funny like "do do" (doo doo) or "to to" (tutu) on the phone with a customer and shoots you a message saying "He just said doo doo." The appropriate response and reply could be "CSTMS"
cstms by Virgil Brazle October 14, 2008
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Chuckling silently to myself. Used similarly to lol, but when you're not actually laughing out loud.
Yeah I was cstm when I heard about that.

Cstm Bullshaz, you n00b.
cstm by [0SC]Just John December 26, 2008
Related Words
Cstm: Cant say too much. when something cant be said.
-Ayo bro you dating that girl Ashley?
-sorry bro Cstm
Cstm by unknown Hernandez January 8, 2020
acronym for 'chuckle quietly to myself' used in teh intarwebz.
Dude: That pun was mildly amusing.
Me: Yeah, it made me cqtms.
cqtms by twokuhl4sk3wl December 20, 2007
Chuckle Silently To Myself

"Lol" is an often misused term. Many people write "lol" when they don't actually laugh out loud. In reality, the term "cstm" is a more accurate description of the virtually silent noise that escapes one's airway when viewing or hearing something of a semi-hilarious nature. This aim of this term is to make society more honest about the nature of its reactions.
Wow, your facebook status is so funny! It totally made me cstm!!
cstm by therealburninator March 28, 2009
Chuckling Softly To Myself
It wasn't so funny that I was LMAO, but funny enough to be CSTM
CSTM by badboydano September 21, 2011
Means "Chuckles to MySelf". often used while texting or playing an online video game. only use this term when "Lol" is just to much.
guy 1: "That's the third time i died trying to kill the orc king!...ugh."
guy 2: "ctms, you suck at this game"
ctms by Ralph Littlefield March 6, 2009