1. Harass Members for Groups
This is a sure-fire way to fit in! Remember to ask in guild, at least 372 times, for a group. In between /g requests, be sure to /w every single guild member to ask them to go with you. After all, they may not have seen your requests in /g. After five long minutes of looking for a guild group, be sure to start whining about how no one will help you. Whining always works, and your guild-mates will appreciate how much you enrich guild chat with new and interesting complaints.
2. AFK
Once your guildies finally realize how selfish they were in ignoring your requests for a group, they'll join you. As you fill the group, be sure to go AFK while everyone else heads to the instance. After all, a good guildie will summon you there. Once you've started the instance, be sure to go AFK frequently. They don't need you there to heal or tank or cc or dps. Good guildies will just carry you through to get the rep or gear you've wanted.
3. Loot Whore
If you need it, take it! You need the gear so you can help the guild, right? I mean, so what if that drop is better for a feral druid? It's got more AP than your current mail item. That drop off the second boss? You'd hate to see it DE'd, so you'll take it! Good guildies will understand that you really do need everything. Besides, that guy that's been in the guild 7 months longer than you have got that epic from Karazhan last night when it really should have gone to you...so you deserve all this and everyone knows it.
4. Know-it-All
You know this game inside and out, so be sure to share your wisdom with the guild. During 5 mans, tell everyone what to do. Sure, you play a warrior, but you have a lvl 13 priest, so dispensing advice to the healer is completely justified. When you're in a raid, make sure you tell all the raid members how to do a boss fight, even if the raid leaders use a different strategy. Yours is better anyway. But be sure not to give away all your secrets! You wouldn't want anyone honing in on your best farming spots.
5. E-peen Measuring Contests
you know waht i mean...