$('body').click(function(evt){
var eventId = $(event.target).attr('class');
if(eventId == "mobile-menu")
return;
//For descendants of menu_content being clicked, remove this check if you do not want to put constraint on descendants.
if($(evt.target).closest('.cus-popup').length)
return;
$(".cus-popup").slideUp(200);
//Do processing of click event here for every element except with id menu_content
});
Another simple method
$(document).mouseup(function(e)
{
var container = $("YOUR CONTAINER SELECTOR");
// if the target of the click isn't the container nor a descendant of the container
if (!container.is(e.target) && container.has(e.target).length === 0)
{
container.hide();
}
});