i've never heard this word and i cant find it on the internet. the german word for raccon is waschbär (washing bear) afaik
actually, the official french word for raccon also seems to be raton laveur (washing) and not voleur (stealing), but i dont speak enough french to know if they are called raton voleur in some dialect or slang
Imagine being a social worker trying to find people housing and one of the guys in the tent city tells you he already rents a place and just wanted see what living in the park was like.