To accuse someone of something after they accuse you of something. To offer up a courter accusation.
Bill "dude you wore that shirt two days ago, and it sucks!"
Jeb "Yo Dude, you keep track of my clothing and have an 'eye for fashion'"
Jerry "woah Bill just got countercused "
The word for the enivitable counterculture that all this #BlackLivesMatter stuff will spread due to it being everywhere, that will only serve to better spread racism. Sometimes its best to forgive and forget.
Paul: Ugh, you know all this #BlackLivesMatter stuff that is everywhere will only lead to more racism.
Jake: You talking about Anti-Racism Counterculture?