The impotence caused by the ABUSE of the steroid molecule, nandrolone decanoate,commonly known by it's brand name, Deca-Durabolin, including testicular atrophy. Meaning, you can't get it up. Leading to users stacking (combining) it with testosterone based steroids such as proprionate or enthanate to fix this side effect.
Girl: What's wrong sweet heart?
Guy: I got Decca Dick
Girl: damn it! i told you to use proprionate!
It is the ship between Two Characters in the shounen Anime My Hero Academia / 僕のヒーローアカデミア.
The Ship consists of Izuku Midoriya / 緑みどり谷や出いず久く and Bakugō Katsuki / 爆ばく豪ごう勝かつ己き.
It is viewed as a Unhealthy Ship, But Bakudeku Fans seem to think otherwise.
Person A : I Personally ship KatsuDeku/Bakudeku/Decchan.
Person B : I don't Ship it but i respect it, Since they aren't real and people need to stop fussing over anime characters and calling stuff toxic.
Person A : Right? You can't just tell someone that something the like is bad and expect them to Stop liking it, Keep your opinion to yourself! I don't care what you think!
A deccy is a term for someone who is extremely lazy, slothful, walks like a dwarf on stilts ands smokes an unhealthy amount of bifter. They are usually extemely unsociable, British and slightly overweight.
"Jesus, look at that Deccy over there! He's repulsive!" or "I know a Deccy that works in a book shop, he's disgusting"