Top Definition
A Social media activist who gets so enraged they have to tweet/post or re-tweet about perceived injustice.

Can and should be used for good but mostly is used by why teenagers and pre-buscents with little or no knowledge as to what or why there enraged. They just want to "fight the power"
" yo dude the local church trying to stop us skateboarding in their car park, i'm so going to tweet this"

"dude your such a smacktavist"
by Ammo_Singh May 29, 2012

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