Possible Clues:

• Most foul
• Most offensive row is “not English”
• Most evil-smelling tanker's adrift
• Most foul-smelling
• Most malodorous
• Most egregious
• Releasing BO, robe stank -- awfully gross? None more so
• Most objectionable
• Rave about old film, being most objectionable
• Spillage from tankers is most offensive