Language (primarily abbreviations) you'll run across in Myth (many of which aren't in any manual). To keep this guide shorter, it may not include some terms which are common in many other games or chatting, or that you should have already picked up from reading the Myth Manuals
floyn = If you floyn someone, you've "stolen" the color they wanted in multiplayer because you got in before them. Floyning yourself is when you change your own color, because someone already floyned the color you originally wanted.
fr = Flag Rally game type
gb = Green Berets, a Myth II expansion sold by Take 2 Interactive
juke, dance = Zig-zag motion to advance a unit while dodging arrows
koth = King of the Hill game type
kotm = King of the Map game type
lag = When issues with the computer or network connection of either you or the host cause your game commands from being processed, so your units become unresponsive. Always claim lag whenever you're losing a fight ;)
lmoth, hill = Last Man on the Hill game type
loathing = Loathing is an app from Bungie, used for creating maps. Bundled with Myth II.
oos = Out of Sync. Your game has gotten out of synchronization with the other players' computers and the current match is no longer valid. Usually caused by excessive lag, but could be because someone is cheating, or it might be caused by a bug in Myth's code that you've exposed
pigs = Mauls unit
plugin = A file you can add to your Myth install to expand or change the game...new solo levels, new multiplayer maps, new co-op maps, new unit types, new game types. Like a mod in other games
pm, magma = private message, or Project Magma, volunteer developers that keep updating Myth (yay!)
prasp = Post-Release Attention Span Product. This would be things like expansions distributed by Bungie after the initial release of the game.
pus ghol = A Ghol carrying a pus packet, which can be thrown (packets are leftover when a Journeyman heals a wight)
pus bomb, pus satchels/satchel-pus, bottle-pus, mortar-pus = A tactic of using Ghols to throw or carry something explosive into enemies, then having a "pus Ghol" throw pus to detonate the explosives. Be wary of Ghols running at you! Their "gifts" can also be detonated by dwarves, Fetch, and fire arrows
rdf = Rocket Dorf Fest, a game using super-powered dwarves and ghols. Some have rockets, fly, shoot fireballs, etc.
rdy, ready = Ready; in a regular hosted game, the game can't start until all players click "Ready". In an auto-hosted game, the WILL start on time, and any un-Ready players will be automatically booted. For more details, read about Autohost
sink = The tactic of stealthily submerging thrall or wights in deep water, to bring out later
slugfest = a game using only Dwarves, Wights, and Thrall
soon = Bungie became famous for never giving estimated release dates (after a bad experience), instead just saying that the next patch or whatever would be released "soon"...even when the release was a long ways off.