Pretty much if you're in RP and someone says, describes, or does something you don't understand; find the OOC (Out Of Character) Thread and ask for clarification of the words/phrases/post. Someone should answer in a meaningful and polite manner.
There are a lot of other vocab words that aren't described here. But those are more for RP. Some Minor friendly, like scritch and glomp. Others... Well NSFW.
In all honesty. If you speak or can read/write English decently; don't use txt, 1337 5p34k, or other annoying variations. You'll make friends and fo well. The more mature you seem outside of RP the more internal respect you will get.
But when doing RP, if your character is hyperactive and spastic... Then stay in character.