This acronym stands for "Don't Care Didn't Ask". It conveys that you just do not give a fuck about what someone is saying, and you do not want to hear about it.
Person 1: Dude! I just found out that birds fly 30 miles per hour!
Person 2: DCDA.
Person 1: What?
Person 2: I don't care, and I didn't ask.
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Donโt care, didnโt ask. Used against your friends when they say some dumb shit, or against toxic shitters in call of duty.
Dumbass Friend: Hey bro, my grandma just died, you think you coul-
You, the good friend: DCDA, shut up and go for a run you fat fuck.
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Acronym for "don't care, didn't ask." Use this when you genuinely don't give a fuck about what someone says.
John: Yo bro, did you know my best friend's cousin's friend just asked his crush out? She said yes, too!
You: dcda
person 1: OMG I GET MEGA NEON FLY UNICORN IN ADOPT ME
person 2: dcda hahaha
person 1: IM CRY