1. humidity blotch or stain (Rioplatense, possibly dated, dated)

2. bad luck (colloquial, Southern Cone)

a. Person who is a carrier of bad luck. (colloquial, Rioplatense)

3. gloom; crank; bad mood (colloquial, Rioplatense, Bolivia)

4. mould (Rioplatense, possibly dated, dated)