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1.
Ju-Cu is a shortened version for the words "Just Curious".

See also: JW
Boy: Hey did you do the report from last night?

Girl: No. Are you JW?

Boy: Ha! NOOO. I did mines, I was Ju-Cu about you.
by Colombian_Kid January 19, 2011
 
2.
When one sneezes and snot flies out of their nose while simultaneously shitting themselves
Did you just jucus
by Boe hoe April 28, 2014