dingus
1. One who is stupid or foolish. Geez, he keeps pulling on a door that's clearly marked "push"—what a dingus.
2. A name for a gadget or thing whose actual name has, typically, been forgotten. Hand me that dingus or whatever it's called, will you?
3. vulgar slang A penis. I don't want to see your dingus—pull up your pants!
dingy
1. adjective Crazy, wild, or strange. There's a guy on our corner who shouts about the end of the world; I think he's a little dingy.
2. noun, vulgar slang A penis. I don't want to see your dingy—pull up your pants!