Definition of dingus
1informal : an often small article whose common name is unknown or forgotten : GADGET, DOODAD sense 2In his [Dashiell Hammett's] writings of the period from 1924 to 1952, "dingus" signifies, variously, a magician's prop, a typewriter, a short story, a novel, and an elusive artifact, a black bird better known as the Maltese Falcon.— Mark McGurl… the boy was decked out in a fancy uniform with silver buttons and a cap with a dingus on the top.— Sholem Aleichem
2US slang : a dim-witted, silly, or foolish person —often used in a joking or friendly wayBy most accounts, [Hunter] Strickland is actually a sweet feller. Respected by his teammates, nice to the fans, et cetera. But he sure is a dingus on the mound sometimes.— Grant BrisbeeThink back to when you were 17 and how much of a dingus you could be …— Pacific Takes
Not seeing a references to the male genitalia.
Dingy, Ding-a-ling, wang, D, Schlong, Tally Wacker, one eyed monster, Belichick....sure. Dingus...No