Possible Clues:

• Glue, e.g
• Sloppy, sticky stuff
• Output from Slimer in 'Ghostbusters'
• Idiot forgetting his name is mud?
• Like supersoft caramel
• Not entirely splendid, slimy stuff
• Pass round sticky stuff
• Hair gel or wet tar
• Glue ... or a rhyme for 'glue'
• Melted peanut butter, for example