Neither party benefits from this transaction, and it is usually considered the low point of any friendship. This uncomfortable incident usually leads to a brief hiatus in the friendship while both parties come to terms with their awkward feelings of guilt/shame.
An awkward hand job may be used a form of currency or bartering system for minor favors or small amounts of money.
Used in conversation as "AHJ".
Person 1: I can pay you back that money I owe you next friday!
Person 2: It's fine, just give me an AHJ and we'll call it quits.
Person 1: ... fine... :-/