Related Clues:

• Move imperceptibly
• Flow oh so slowly
• Move like honey
• Toxic waste, in some B movies
• Display in abundance
• Let out slowly
• Slimy stuff
• Seep (through)
• Creep through the cracks
• Move like flood mud
• Behave like lava
• Behave like lava out of a volcano
• Slimy semi-liquid
• Exit gradually, very gradually
• Drip like slime