OTP stands for "one true pairing", a pair of characters who suit each other/got the chemistry together. It is normally used for normal pairing, but can be also used for friendship (or anything, really).

I am so glad you are the fan of Vorenus too. I can't wait until the next season of Rome begins. Especially I am looking forward to Vorenus being very tortured and full of angst because of what has happened in season 1 finale.

I haven't seen "Dog Soldiers", but I will sure do now. :D . May be I will even re-watch "Trainspotting".:D