Green’s Dictionary of Slang

snit n.2

[Ger. schnitt, a piece, a slice; a small glass of beer; used in Wisconsin for a small amount]

(US) a short person.

Boston Wkly Globe (MA) 30 Jan. 6/7: Persons doomed to everlasting ridicule [...] the ‘sawed-offs,’ the ‘shorties’ and the ‘snits’ of society.