Acey-deucy (slang/vulgar): a slang variation of AC/DC which is derived from the initials for the two types electricity: alternating current (AC) and direct current (DC). Used to describe an individual as being bisexual.
Poop or having taken a poop. Going to the bathroom is often times associated with the number two because it is a way for school teachers to identify a child's needs in the bathroom. The number one being associated with urination and two being associated with taking a poop. Lucy is short for Lucifer so that "Lucy Deucy" means haven taken a poop.