Originating from the title "Batty Boi," batman refers to a male who is a homosexual (or Batty boi.)
When you come across a gay couple for example you could describe them as "Batman and robin"

Sex move in which, post-coitis, the sex partner turns over to snuggle and finds you are no longer there.

A variation of the teabag when you hang from somewhere (such as a doorframe) putting your nuts at eye level with the person to be batmanned. You then proceed to place your nuts on the person's head as normal for a teabag.

A man with mad, wicked skill in pleasing his partner with a multitude of gadgets.

When you are fucking a GILF from behind and the old woman skin on her arm starts to sag until it looks like batman's cape!

To successfully do this one should put up a lamp behind oneself so you get a shadow effect that appears to be the bat signal on the wall.

a sex act where while having sex with a female you pinch both of her labia between your finger and your thumb and then spread them out to make them look like bat wings.

He isn't gay: he just likes to make you gay.