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I think getting on your GF right infront of an AMOG can be a bit obvious and make you seem afc. anyone agree?
If you exxagarate, it will be obvious indeed. It will show some insecurity of you.
An alternative is to have a few words with the guy (some casual talk), then excuse yourself for a very short moment (like you are going to take a leak or without mentioning where you are going, stay away very shortly). After you get back than resume the casual talk with the guy for 20 seconds, hereafter make out with your GF while you keep eye contact with the AMOG (while you tongue her).
In this way you circumvent the problem of appearing scared that someone will steal your girl, you appear polite to the AMOG and you make clear that YOU are there with this girl. Everybody will get the point. Nobody will have a case against you. Only the AMOG will have the feeling that you are making a fool of him.
A few mechanisms are work here. Your girl (and others in the neighbourhood) does not get the feeling that you are a jealous, insecure guy, which is very attractive to her. The AMOG gets a sense of confidence in his case now you are gone. However, when you get back, you take everything from him that you gave him in the first place. This is very deflating to a guy: he gets the feeling you are the one who is stealing from him (initally, he probably assumed the two of you are not even a couple, this is what gave him the guts to approach in the first place. Now he must face the facts).