Orginated from Jamaica meaning gay. Batty is the word for bottom, so battyman is protraying a man who loves bottom. It is also use as an insult in the same way as 'faggot'.
The signs on pavements (holding road names and roundabout exits etc...) that have two ‘legs’ are called Battyman legs. If you walk through them you gotta stay in the battyman’s protection. You are now gay.
Guy1: Hey man, wtf are battyman legs?!
Guy2: those road signs on the pavements that have 2 ‘legs’.
Guy1: And I can’t walk through them because....
Guy2: coz they’re the battyman’s Legs bro... if you walk through them you’re gonna be gay.
When someone is a battyman on such a large scale, only the comparison to the size of Mount killamanjaro is sufficient to comprehend how much of a battyman they are.
Friend: Im thinking of buying some tickets to see justin Bieber, do you want me to get you one?
Me: No, do i look like a Battymanjaro?