Nomadic, anally parasitic gnomes whom according to local traditions are nocturnal and travel in packs. As with sasquatch there are historical claims of encounter, but such claims are rare and have become less common with modernity.
(Usage Note: Assgnomes are described almost exclusively in plural as they are by definition pack animals. Because of the tenuous nature of their existence it makes it difficult to resolve if singular encounters are possible, but the Usage Board notes that there is no precedent for this in the literature.)
"Beware the assgnomes."