What is SOUSOU in Haitian Creole? Someone told me it means money. I'm here to tell you when I used it, people did not know what I was talking about.

When Haitians say "sou", they might be talking about money, as in Mwen pa gen yon sou. I don't have a penny.

Sousou (or ti sousou) is a butt-kisser, someone who flatters another usually to get something in return.
As verb we say fè ti sousou → to flatter, to kiss ass

Here's an example of the usage in a sentence:
1.Fanfan ap fè ti sousou dèyè madanm nan.  Petèt l'a voye yon zo atè a pou li.
   Fanfan is kissing the lady's butt. Maybe she'll throw a bone at him.

Haitian Creole ↔ English Reference, Look up Haitian Creole and English Words