Here are some pun-based names playing on "Funny Poop Loser," aiming for different tones and levels of subtlety:

Humorous & Obvious:

• Poop Deck of Cards (referencing a losing hand)
• The Brown Note (referencing a sound that supposedly causes bowel movements)
• Number Two's the Charm (sarcastically implying repeated failure)
• Potty Mouth (combining "potty" with a negative connotation)
• Flush with Failure (referencing a toilet flush and losing)

Clever & More Subtle:

• The Excremental Enigma (more sophisticated, hinting at a mysterious loser)
• The Unfortunate Defecation (formal, ironic, and slightly dark humor)
• The Bottom Line (double meaning: the literal bottom and the final result of losing)
• Relieve the Pressure (playing on relieving stress and the act of defecation)
• Going Down the Tubes (referencing failure and plumbing)

Silly & Absurd:

• Poopy Pants McLoserface
• Captain Calico Catastrophe (Calico referring to a cat's coloring, implying a messy situation)
• The Turd Ferguson (a silly, memorable name)
• Sir Reginald the Relieving (over-the-top and humorous)
• Professor Poopypants (absurd and comical)

More Abstract & Evocative:

• The Great Brownout (referencing a power outage and a poop-related mishap)
• The Final Flush (referencing the end of something and a toilet flush)
• The Unfortunate Deposit (formal and slightly dark humor)
• The Sedimentary Loser (referencing geology and failure)
• The Cesspool of Calamity (dramatic and evocative)

The best choice will depend on the specific context and desired level of humor.