Summary of the inside jokes as I remember them:

Nude Photos: a newbie member: Biscuit, who is friends with Brandy and Ptbryant from Maryland, has a personal blog, and some of these bloggers do a Half-Naked-Thursday thing where they post pics of themselves...that link was posted...and I believe it's down now. No biggie, but you wouldn't want your coworkers checking it out. By the way, Biscuit is a nice person and not the least bit pervy. Well...maybe a little bit.

Mr. Serious: a bigass burrito.

Jschen' Gals: Jason will routinely post about girls he's interested in, and refer to them as abbreviations to preserve their anonymity.

Carpal Tunnel: Brandy's two aftermarket friends.

DH: Devoted Husband

DW: Devoted Wife

Team Sugar Shorts: The SoCal gals (et. al.) that do group rides [EDIT: on bikes] together.

...please feel free to add yours.