If the 6th definition of nifty on Urban Dictionary is exhaling weed immediately after inhaling it do avoid the taste, when you shut down nifty’s, you like the taste of marijuana. Shutting down nifty’s with the boys is patrolling parties and making sure NO ONE attempt to “pull a nifty”.
What one often does after a breakup -- usu. the end of a longterm, monogamousrelationship -- which involves promiscuous sex and/or sex play with a variety of partners. Sometimes accompanied by malicious intent.