Indirectly tweeting something about someone without mentioning their name. Even though their name is not mentioned, it is clear who the person tweeting is referring to.
Are you joking #sorude #subtweeting
by fridaymyday September 20, 2013
tweeting indirectly about someone without saying them or tweeting at them
Dan- tweeting indirects about your own problems as a cry for help xD :\

Cat- @dan stop subtweeting me pls.
by Phil is not on fire. September 7, 2015
When u go to subway and tweet about it
I went to subway and start subtweeting
by satchel1 September 8, 2014
A tweet (message posted on the website Twitter) that mentions a Twitter member without using their actual username. Usually employed for negative or insulting tweets; the person you're mentioning won't see the subtweet in their Twitter timeline as it doesn't contain the @ symbol that every Twitter username has.
Someone wants to criticize a person with the username @JohnDoe on Twitter but without that person seeing the tweet in their Twitter timeline. Instead of tweeting "I think @JohnDoe is an idiot" they would subtweet "I think JohnDoe is an idiot" or "I think John Doe is an idiot". In each case the @ symbol is missing so the tweet would not appear in @JohnDoe 's Twitter timeline.
by Bookley December 16, 2012
A form of tweeting used only by pussies because they are too scared to @ someone
"Hey go check twitter I think Tina is subtweeting you." "Oh man, she's such a pussy"
by Jake kanjam June 4, 2014
when that ratchet on twitter or instagram says something about one person but doesn't use their name so it's anonymous
subtweeted: "some people need to stop being so fake."
person it's about: "say it to my face lisa!"
by crabs snail February 14, 2017
It's the shortening of "subliminal tweet" which is directly referring to a particular person without mentioning their name or directly mentioning them and it basically indicates that the tweet in which the hashtag is used is a subliminal tweet.

Basically, it's talking about someone behind their back but sort of in their face on Twitter!
Man, I wish this girl would stop subtweeting about me and just say what she has to say directly. Triflin'!

I wish #oneofmyfollowers would stop #subtweeting and just come out with what he wants to say! Ugh!
by SubUrbanBruh August 10, 2010