addingTrigger.js

// Store a copy of the original jQuery#removeClass method
var _originalMethod = $.prototype.removeClass;

// Replace the jQuery#removeClass method with our own
// custom function
$.prototype.removeClass = function(){
  
  // Convert the arguments object into an array
  var args = Array.prototype.slice.call(arguments);
  
  // Call the original jQuery#removeClass method
  // and pass it the current context and arguments.
  // Record the response as well.
  var response = _originalMethod.apply(this, args);
  
  // Trigger our hook and pass it the current
  // context and arguments
  $(document).trigger('removeClass', {
    context: this,
    args: args
  });
  
  // Return the response from the original function
  return response;
};

bindingToTrigger.js

$(document).on('removeClass', function(evt, obj){
  
  // obj.context is the element (or list of elements) who's class was removed
  // obj.args are the original arguments passed to the jQuery#removeClass method
});