Copy+pasting text in a game

[John_Connor]

I've been wondering about this for a long time now, and unless I missed it above, there's still no answer. How can nobody know how to do this? Every cow game I enter, somebody starts spamming something about getting the leg, someone else starts countering with a dozen lines of "shut up shut up shut up...", and at other times people just spam whatever line they feel like 'cause they want to be annoying and fill everyone else's screens with text. There's no way any of these people are actually typing the same line over and over at 1000 wpm without errors.

Is it just that there is a way to repeat your last line, but not to specifically copy and paste?