half blood prince
friend 1:dude i just read harry potter book 5 friend 2:  well half blood prince is coming out so you can keep your pants on
"half blood prince(hbp) is the 6th book in the "harry potter" series
"friend 1:dude i just read harry potter book 5 friend 2:  well half blood prince is coming out so you can keep your pants on" What is the definition of "half blood prince"?