the exact meaning of the word is $B!H(Bplease$B!I(B and
many times is the answer of a $B!H(Bthanks$B!I(B with the meaning of $B!H(Bbe welcome$B!I(B.
We also use ParaCalo ! when we receive a call.
For sure ParaCalo is very polite and no there is never bad meaning in it.