Bedaleing means goofing around, it's used when you don't know any other word to use in a situation where the other person is so goofy and silly, you forget the word you were going to say completely and instead say "bedaleing".
Ian Bealing is a term used when you have to hold in a laugh/squeal/snigger in an awkward situation such as at work when its deadly quiet or at a funeral and as a result of trying to laugh quietly or not laugh at all you end up pulling the infamous Ian Beale face.