nothawkingbird - This is in reference to early in Kate's start with the Young Avengers. She had Hawkeye's bow, and Mockingbird's staves (also the Swordsman's sword), so the reaction from Eli was 'who are you supposed to be, Hawkingbird?' Despite her numerous denials and generally hating the name until she was awarded the Hawkeye moniker.

waylostandfound - This comes from Nathan's speech at the end of Season Two where he was talking about how he had lost his way, and his journey to find himself. Let's just say, it had been a journey in process for much of his life.

thexanwhosees - A combo of Xander and the reference to him being The One Who Sees in the group, the normal observer who reminds the rest of the group of their humanity.
notadamnangel - Basically sums up Dean's reaction to the idea of him being Michael's vessel, and also the angels have been trying to have him be their bitch since they brought him back from hell. Also a general statement that while Dean has a lot of good qualities and is a hero, he's not perfect and frequently sins and screws things up.