
• (n.) A tribunal or commission having charge of the revenue derived from trade and navigation. • (n.) A collector of customs, as at Canton; an overseer of commerce.
Found on 
http://thinkexist.com/dictionary/meaning/hoppo/
 Hop'po  noun   (a)
Hop'po  noun   (a)  A collector of customs, as at Canton; an overseer of commerce. 
 (b)  A tribunal or commission having charge of the revenue derived from trade and navigation. [ China]  
 Hoppo men , 
 Chinese customhouse officers. Found on 
http://www.encyclo.co.uk/webster/H/61
  No exact match found.