Chat Script

I see a lot of players that chat with pre-written phrases (OMG - FTW - loosers - noobs ....) while they are moving in game !!!
I'm just confused how do they do that ? They don't even stop for a second to say that they are fast at typing
I thought that there is a script or something that uses hotkeys for the phrase like when you press "P" it chats noobs for example
Any Ideas ??

bind key "say Phrase" type that in console...
Example - bind m "say Noobs"

type this in console

bind "p" "say OMG"

p being the key you press and SAY is required for it to be said in all chat