with roots from afro-american culture the term "loose as a goose" is used after committing an act that is either immoral, or wrongs someone in some way the perpetrator then praises him/herself with the exclamation "loose as a goose!" repetition is optional, however usually followed by a hand gesture moving in a horizontal movement with the arms pointed up at the elbow and wrists partially limp. Depending on perspective the "loose" person can either be an ass, if you are on the recieving end or a source of comedic relief if being regaled with tales of assholery.
Ermias told me yesterday that while bagging a woman's groceries she dropped a five dollar bill on the ground, he picked it up and when she noticed she dropped her five dollars and confronted Ermias he simply said "what five dollar bill?", continued with bagging groceries while repeating to himself the phrase "loose as a goose!"