Degen is the shortened version of Degenerate - capitalised because Degens are a species.
They have all the qualities of a Degenerate yet are still somehow less mentally capable.

Origins are Philipp Degen, a Swiss football player.

Mercury retrograde is the act of taking a shit whilst mooning one or more human beings. Your day can typically being going well, according to your horoscope, until you are forced into witnessing Mercury retrograde. Performing Mercury retrograde will often speed the astrological cycle forward for the individual performing the Mercury retrograde, bringing about happy and fruitful times to come.

Gambler, "degenerate" gambler. Refers to card players, racetrack bums, bookies, dice & craps shooters, proposition (prop) bettors. Gamblers consider other gamblers degens, but not themselves usually. Card players consider sports bettors "degens." Sports bettors consider slot machine players degens. Etc

A stock market trader who yolos all their money on a degenerate investment in the hopes of it mooning.

A chronic gambler who will bet on any obscure sport you can name, Russian ice hockey: been there done that. Irish ice curling: yep. Korean badminton: bitch please I can name every player

1. A degenerate induvidual. Characterised by a willingness to decline in financial, mental and physical health on an ongoing basis, often by means of his or her chosen party favor.

A degen is one step above the dero or derelict in the scale of madness.

Stylish to the max. Any individual who can make friends with anyone