Usually meaning your extremely gay, or one of those
fags that rides a harley, and can also
mean that you have turrets and are painfully
awkward.
Guy: Hey whats up*twitches*
Girl: WTF?
Guy: So you wanna get down and dirty?*(twitches)
Girl: Why the
fuck are you twitching so much?
Gay as porter is typically shortened to "GAP"