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1.
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 19, 2013
 
2.
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 04, 2014
 
3.
When u go to subway and tweet about it
I went to subway and start subtweeting
by satchel1 September 07, 2014