WHAT ALL THE JARGON MEANS
Gundam Wing

There are plenty of sites on the net where you can check out the series, its story and characters, if you want to know more about it. I don't recommend any in particular, but here is a link to the official Bandai site.
Glossary - for the fics and pics
Here’s your guide to the words / numbers / abbreviations / phrases used on the site :
('borrowed' somewhat from here, thanks!)
The Pilots and their 'numbers' :-
01 -- Heero Yuy
02 -- Duo Maxwell
03 -- Trowa Barton
04 -- Quatre Reberba Winner
05 -- Chang Wufei
06 -- Zechs Merquise / Milliardo Peacecraft
R -- Relena Darlien / Peacecraft
(icons of the pilots courtesy of http://www.templeofthegoddess.com)
het = guy / girl
shounen ai = guy / guy - affection
yaoi = guy / guy - physical attraction / relationship
yuri = girl / girl
1+2 (e.g.) = friendship, potential romance
1x2 = sexual relationship
seme = guy on top i.e. the penetrator
uke = guy on bottom i.e. the penetrated
and therefore ... 1x2 (e.g.) is seme x uke
(also 1=2 is sometimes used to denote equality in a relationship)
AU = 'alternate universe' i.e. usually not in the Gundam Wing canon world
angst = sadness
BDSM = 'bondage / sado-masochism'
canon = going strictly by the official timeline / characterizations
citrus = limes and lemons throughout
lemon = full sex or near as dammit! lime = kiss, touch, sexual attraction but not consummated
warning for any other reason -
e.g. adult themes/violence/nudity/emotional distress
death fic = somebody dies
fluff = silly fun for fun's sake
OC = 'original character'
OOC = 'out of character'
POV = 'point of view' i.e. a fic told through first person narrative
PWP = 'plot? what plot?' usually just an excuse for graphic sex
sap = awwww-ness
song fic = a fic either based on a song, or accentuated by it
squick = ewwwwwww!!-ness in relation to sex
WAFF = 'warm and fuzzy feeling'