1. One who is stupid or foolish. Geez, he keeps pulling on a door that's clearly marked "push"—what a ding-a-ling.
2. vulgar slang A penis. I don't want to see your ding-a-ling—pull up your pants!
ding-a-ling
(ˈdɪŋəlɪŋ)
n. a stupid person; a giddy person who hears bells. This ding-a-ling comes up and asks me for a dollar for the orphans. I tell her I got all the orphans I can use at any price.