When, your wife tells you how embarrased she is that she forgot to shave her knees today-
-And that this is terrible because she also forgot that the slit in her skirt showed these aforementioned knees-
Do not, I repeat, do not refer to them as ‘Wookie-knees’.
Even is you are obviously doing this in JEST.
Furthermore, it isn’t wise to attempt to explain that Wookies are actually cool… well cool to a geek, at least.
This tack to my suprise did not generate the desired calming effect.
‘Words’ were said. In fact, the term "Dumb-ass" was applied liberally to my personage. 
Just some advice I thought I might share.