The guy was thin about 5' 10" (178 in foreign measurement

Outside the shopping centre is a sort of fake piazza; tables and chairs for people to eat and drink at. This bloke was sitting down on one of the chairs and my attention was grabbed by the fact he was jiggling his right leg and scissoring them together in a rhythmic action.
This sort of thing always grabs my attention, just in case, you understand.
Anyway, it became apparent he was with some ladies and they were waiting for a cab to arrive. I decided to 'lurk' in the vicinity (officer)

He now stood up completely and kept jiggling around in circles like someone who is impatient, and then every time the ladies turned back in conversation he started an action I haven't seen before. His right hand was curled up and he would swing his knuckles from his abdomen across his crotch and then after he had brushed over it, he would bring his hand back up and give it a quick squeeze.
He kept doing this even after they had moved to the kerb side waiting for their cab to arrive. He would only do this knuckle shuffle. squeeze routine when his circular hopping/walking turned him away from the women he was with.
Sadly their cab arrived and they all jumped in.
The interesting thing is if he did need to let a little fluid out, the toilets were a 1 minute walk away.
I could only see the waistband of his underwear which were Bonds brand and I think they were briefs. He was so lanky that there was no discernible bulge in his shorts, another reason I think he was wearing briefs; they could have been black or dark blue. There was only so much looking I could do, you understand.
Anyway, it certainly brightened up my shopping expedition and my afternoon :wink .