Where you are able to happily grasp and retain a nice gal's "upper" hand --- i.e., the one opposite to her "lower" hand from the shoulder that she's lying on --- while stretched out on your sides at the beach or spooning her in bed.
Being allowed to gain the upper hand while spooning with a nice girl is always a pleasure; just remember to always employ the wrist-twist compromise to ensure maximum comfort for both of you.
A measure at any given time of who likes who more in a relationship. The person with the upperhand is allowed to make decisions for the couple, to slack off doing chores, to get more sexual favors, etc.
After Yewande wrote her love poem she's definitely lost the upperhand! Too bad for her, poor little tall girl...