Which is Old English for "Be thou whole" i.e., 
may you be healthy, all in one piece, centered, 
grounded, focused.

And the proper response is "Drinkail!"

Which could mean:

a. Drink in good health, or

b. Drink it whole, chug it down, drink deeply and 
too well, let's get wasted, or 

c. Simply: drink ale; life will be too short to 
waste time with American-style beer when it is 
invented in the evil days leading up to the 
apocalypse.