You clearly didn't play Halo. Teabagging is a gesture of goodwill, you would do it to show you are having fun with the game and not being a try hard, you would walk up and do it to someone and they would do it back and you would mess around.
Also, prove it is 'teabagging' and not just crouching up and down, I see no genitals anywhere.
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There's a difference between teabagging in front of people and teabagging their corpse. Both definitely communicate a different message.
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I played every Halo, minus ODST.