We used to use that at school as 'code' for going for a, erm ... fag.
Wasn't the most imaginatative code, I grant you.
(
Je suis un vagabond is an unfunny, up your own arse middle class knob,
Wed 10 Mar 2010, 9:59,
archived)
Also not a phrase best employed in New York.
'Just nipping out for a quick fag' tends to be misconstrued.
(
J Peasemould Gruntfuttock Alpha Mike Foxtrot,
Wed 10 Mar 2010, 10:51,
archived)