a movement created by mostly urban african americans to intimidate witnesses and stop informants from getting them in trouble. a large red stop sign with "snitchin'" directly below it, supports this movement. sometimes associated with drug trade/dealing and/or violence (usually gang-related) in urban areas.
"did you see that shirt ______ was wearing?"
"no, what did it say?"
"it was like one of those street signs that say "no parking anytime" but it was modified to say "no snitchin' anytims <---->""
"hahah, he should stop snitching"