Stream-wank
Wanking off to porn that is streamed via your mobile phone.
Sam: Hello Gareth, Have you christened your new mobile phone?
Gareth: You mean a stream-wank?
Sam: Yes
Gareth: Yes I was tugging one off to a video of your dad as I was walking down Oxford Street
Gareth: You mean a stream-wank?
Sam: Yes
Gareth: Yes I was tugging one off to a video of your dad as I was walking down Oxford Street