"Usche" means a non-respected or non-respectable young woman with a taste of low social background or bad history
especially about men. It's youth language and developed
from Nickname "Uschi" which
is a short form of German name
"Ulrike" and was very popular around the 1980s-1990s but now has low reputation. Especially used in southern Germany around Munich in Bavaria where "Uschi" was very common. Can be used in different contextes, similar to american "chick
" especially by young women talking about another young woman.