A person who discusses their twitting frequently and enthusiastically, causing irritation.
Person A: Did you read my tweets this morning? They were so funny!
Person B: Get lost, nitwitter.
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a derogatory term used to refer to the green-robed villagers from minecraft
PMC soldier: THIS GUY IS SUCH A JOBLESS NITWITTER
PMC soldier 2: ikr, nitwitters deserve to die
DewPieDie: what a fucking nitwitter