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1.
definition (a): stuff; crap

definition (b): crappy person; loser
(a)"What the hell is all that malaca on the coffee table?"

(b)"What's a beautiful woman like you doing with a malaca like this?"
by Scoopzilla June 17, 2004
 
2.
Malcas refers to the word mildew, grime, dirt,mold, basically everything that has to do with kitchen and bathroom crap. Malacas cannot be cleaned up for it is permanent.
"Ew! Theres malacas in my bathroom!"
by apersonthatiscool September 26, 2009