A person who is highly ineffective in all areas of endeavor, despite reasonably good intentions. May be likable but unreliable and disrespected because of repeated failures.
A floopdooby is similar to a sad sack, Charlie Brown, feeb, weakest link. Most families have one somewhere in their family tree.
A liquid-composed stool that seeps from the anal area into one's underwear after an attempt to fart or a heavy laugh takes a turn for the worst. Diarrhea chunks, stool discoloration, and blood seepage may or may not be present, but public embarrassment is always guaranteed.