Where are you going?
The pull on professor putricide is complex, it requires one tank to run in and pick up the abomination debuf and the other pick up the boss and place him on the green ooze spawn point. To time it properly, Atlassia would call out a warning.
Atlassia: OK, I'm going now.
Furgin: Where are you going?
Self-explanatory.
Razorscale
The answer to every question except "What is the weekly raid?"
Swoon?
In combat with the Lich King, Thatrayna was calling out devouring plague targets. Instead of a simple, single call of someone's name he repeated it a number of times.
Thatrayna: Swoon! Swoon! Swoon!
2 minutes later
Furgin: Swoon?
Ok, it was funnier at the time. To relive this awesome moment, http://www.youtube.com/watch?feature=player_profilepage&v=xlBrKXsfaMw#t=70s
Can we attack it yet?
After being told not to attack Ragnaros strait away due to boss mechanics, Borunn asks (over two and a half minutes in): Can we attack it yet?
Sorry Boo, it's too funny not to add it here 
http://www.youtube.com/watch?v=NUnYL2U_-xg#t=2m30s
Class/role quick reference:
- jedi is a Paladin
- jedi is also the nipple
- Every raid needs at least four priests.
- lolzcat will need to respec to heals for this one, sorry
- lolzcat can still roll on tank gear
"Let me just eat something"
Because we all forget to satiate ourselves before a pull. Furgin most of all.
Biebering
Similar to a Rickroll, 'Biebering' someone involves tricking them into visiting this link (NBF) or somehow exposing them to an image of Justin Bieber (NBF). This can also be done offline – for example, mailing someone a Justin Bieber calendar.
Due to significant abuse, all non-Bieber links given in IRC must be qualified as 'BF' (Bieber-free). This system relies on an honour code. If broken by someone, people are unlikely to follow links they post EVER AGAIN.
“We’ve got this”
Said only when it is inevitable that we are going to down a boss and there's absolutely no chance of us wiping. No, really. Absolutely no chance of wiping whatsoever.
Deadheart can interrupt
After an attempt on Kel'thuzad.
Furgin: Good work with the interrupts, Boorunn.
Deadheart: (slightly hurt) I interrupted too.
The one joke to Rule them All
Ok so we really only have one joke, and that is that we only have one joke, because nothing else on this page is actually funny.