The guy that steals the attention of the girl(s) you are talking to at a place, party, bar, club. etc.
This can also be a verb used to describe the way a group of girls disqualifies and dismisses an AMOG.
"There was only one group of hot girls there last night. I started talking to this blonde in the group. I asked her if she had a boyfriend and then it was over. Her friends totally AMOGed me and took her away to the dancefloor."
"Always NEG the target so her friends don't AMOG you."