Unwatch all repos in an organisation

unwatchAll

var auth_token = $("input[name='authenticity_token']")[0].value; 
$("a.repo-name[href^='/THEORG']").each(function($elem){ 
    $.post("/notifications/subscribe", { 
        authenticity_token : auth_token, 
        do : 'included', 
        'repository_id' : $("form.js-unsubscribe-form #repository_id", $(this).parent("li")).val() 
    }); 
});

When run, unwatches all repos in 'THEORG' organisation

looks like this is some jquery code. Where do I execute it? Creating unwatchAll.js on my machine but how do I execute this?