Snot
From Tardis Wiki, the free Doctor Who reference
Snot was a name given to mucus expelled from the nose. (TV: Space Babies [+]Loading...["Space Babies (TV story)"])
Hex was once covered in snot by a snot monster. (AUDIO: The Dark Husband [+]Loading...["The Dark Husband (audio story)"])
The Bogeyman on Baby Station Beta was created from the discarded snot from the babies. (TV: Space Babies [+]Loading...["Space Babies (TV story)"])