cstm 

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

Cstm 

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

cstm 

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

CSTM 

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

cstms 

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