A mild slang name for a penis, supposedly less offensive that cock, prick, or dick, it does not have the fecal connotations of dingleberry but is used to describe the penis in much the same circumstances by much the same people. In addition it can also be used as a mildly disparaging term for a person who has exasperated you by doing something atypically stupid.
"I had to rush like hell to get here on time. I was halfway here when I remembered I'd left the contract in my desk at home and had to go back for them, I felt like a right dooberry."
the word "dorbee" is derived from the 1998 short film "dorbees: making decisions" about microscopic balls called dorbees. the theme song includes the quote "why don't they go away" when talking about dorbees, so you must be one since you don't go away