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."