A group of technical support agents typically more knowledgable than the average (tier one) agent. Tier two agents are in most cases, morbidly obese, unshowered, and anti-social.
Tier 2 agents are also characterized by their affinity for WoW (World of Warcraft) and mountain dew, many empty bottles of which are strewn throughout their workplace.
Tier 2 agents' weaknesses include, but are not limited to, direct sunlight and members of the opposite sex.
Tier 2 may also be used as an adjective describing anyone inherently "nerdy" in nature.
"Dude, get off the damn computer, you're being tier two-ish."
"Seriously, take a shower, you're smelling a little tier two-ey."