To stick, like boots in mud
Unburned carbon (smoke) from a steam or diesel locomotive, or multiple unit.
Bits of rubber which are shed from tires during a race and collect off the racing line, especially on the outside of corners (cf. marbles).
A glue or paste made from starch.
Low cloud, fog or smog.
To flow like goo or goop, to move in a slushy way.
To cover someone in gloop or goo.
Any gooey, viscous substance.