It's time our vocabulary was brought up to speed. Some of my suggested additions are below; please chime in with your own.
Beer hound (n) - a dog in your brew area "Say, fellows, there seems to be fur in this glass." "Yup, that's from the beer hound. Now shut up and drink it."
(v - colloq.) - furiously sniffing a pint for sensory-evaluatory purposes "Jermaine beer hounded the stout until he found the diacetyl."
Cold break (v) - to damage another's hydrometer or beer glassware without their knowledge, then leave without telling them. "I cold broke the Hacker-Pschorr boot in the rumpus room - the base cracked but no one was around, so I put it back on the shelf and walked upstairs."
(n) - damage sustained by one's equipment in such a fashion. "Aw man! My Hacker-Pschorr boot has a cold break!"
Hopback (v) - to repay borrowed boil additions; interest may or may not be accrued. "I was out of Centennial when I brewed this IPA, and now I need to set aside a six-pack to hopback Griselda."
Top-crop (v) - to slurp foam from the top of a just-poured pint so you can fill it all the way up. "Say, that's an awful lot of foam. I better top-crop this glass before I give it to my mother-in-law."
Yeast bank (n) - a reserve of hidden funds specifically maintained for sub rosa homebrewing purchases; syn: Swiss bank account, offshore account, piggy bank, coffee can, doomsday stash. "Yikes! I need some malt! Time to make a withdrawal from the old yeast bank." "What are you talking about?" "Nothing!"