Happy slapping is so 2005

To be too cool for school these days
you have to do the Seagull:

In schools all over London, apparently,
break-times are seeing boys running into the
bogs to masturbate furiously, collect their
jizz in the palms of their hands, then go out
and find a younger kid.... then slap them in
the face while shouting "SEAGULL!"

Try it in the office when you're bored.