A junkie term used to describe when you slowly pull on the plunger on the syringe, the blood will shoot into the syringe, having a flag waving appearance. This is a way of knowing that you've hit a vein.

remember kiddies, if it's red(dark red, vein) go ahead, if it's pink(bright red, artery) stop and think
Sarah knew she hit a vein when she saw the flag. She then pushed on the plunger to get the H in her system.
by tonitewedineinhell July 26, 2008
A junkie term used to describe when the blood flings out into the syringe from pulling the plunger. This is a way of knowing you hit a vein. The reason it's called 'the flag' is because when the blood comes out it has a flag-waving appearance.
Sally knew she hit a vein when she saw the flag, she carefully pushed on the plunger of the syringe and waited anxiously for the rush.
by tonitewedineinhell July 10, 2008

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