Refers to when a player receives a "Killamanjaro", a medal in the popular video gameHalo 2 given for a string of kills, but implies that was earned by killing "newbs", and not respectable players.
I got a manjaro by killing those stupid babbling 13-year-olds over and over again.
Similar to hamstrung. A term used when being took advantage of financially due to good will by a close friend. Usually it is more of a hassle confronting the unfair situation as not to spoil the mood.
Person 1: Why did we agree to split the bill when Tom ordered a starter and a cheeseboard.
Person 2: come to think of it, he was the one who proposed the idea to split it in the first place. We've been proper manjaro'd here like.