One thing that sets a gamer and a normal person apart? The way he/she talks.
Often times people feel offended or confused once a gamer starts blabbing about his/her stuff...
So I decided to give you a little list of our strange alien terms.
This can also serve as a newbie guide for first time gamers.

MMORPG (MMO to make it shorter) or RPG
>Massively Multiplayer Online Role Playing Game
Fantasy/Science Fiction inspired games with complicated menus, experience point based level advancement and/or turn based battle systems.

Newb (you might confuse this with Noob- an insult which means...you're stupid.)
>a Newbie, a new player.

NPC
>Non-Player Character
Any character in a game that cannot be directly controlled by a player.

Lowbie
>Low leveled character.

HP
>Hit Points
Your character's Life

MP
>Mana/Magic Points
The energy your character spends to cast a skill.

SP
>Stamina Points
Your character's endurance.

Pots
>Potions
Are items you use to heal you HP, MP or SP.

Quests
>Are mission that either give you money, equipment, or experience points.

Exp or XP
>Experience Points
May be presented in percentage or in normal numbers, these are the points you gain from monsters after you kill them.

Mobs
>The monsters you kill in the game.

PL
>Power Level
Leveling your character really fast with assistance from a higher leveled character, can also refer to as Heavy Grinding.

LFP/LFM
>Looking for Party/Looking for Members
If you need people to help you with a quest, an event, or to help you level faster, this is what you shout.

PT
>Party
Group of players

Spawn Point/Save point
>When your character dies this is usually where he/she spawns.

LD
>Level Down
The Exp points you lost after you die.

Stat Points
>Status points
Points given when a character levels, used to increase HP, SP, MP or other stats like... Agility, Intelligence, etc.

Skill Points
>Points given when a character levels to enhance his/her skills.

TP/Port
>Town Portal/Portal
An item used to teleport you back to your base/or save point.

BH
>Boss Hunt
Parties or Guild mates usually do this to get better equipments or higher exp pts.

Equips/Weaps
>Equipments/Weapons

Mule
>A character used for selling items.

Mount
>A form of transport.

Loot
>Items you pick up from mobs.

PVP/PK
>Player vs Player/Player Kill
Need I say more?

GW
>Guild War
Like I said, need I say more?

Feed
>Players do this to gain advantage. (I.E. Giving items, PK-ing to increase ranks, etc.)

That's it for now, I'll update more tips some other time. Enjoy talking alien! haha...