Fill a drinking glass with room temperature water.
With glass in hand, bend over at your waist.
Place your lips on the side of the glass opposite that from which you would normally drink. Your bottom lip should be above the lip of the glass where your top lip normally is and your top lip should be against the side of the glass against the edge where your bottom lip normally is.
Carefully tip the glass away from you and into your mouth.
Swallow and repeat. Your hiccups should be gone.