So many messages

Ok, I've been curious for a long time about one thing, and I feel stupid asking this. Why do people send multiple messages in a row that could be one message? For example:
message 1: Hi
message 2: hru
message 3: want to chat
message 4: i'm horny
message 5: I like bbw
message 6: i like your pic
message 7: do you like (fill in the blank)

Ok, you get the idea. Is there a reason for this? Anyone?

Just to clarify - it's all at one time. In other words, all messages are sent before I can respond. I look away from the screen, and back to see I have 5-7 messages, and when I click on the message envelope, I discover they're all from one person sent at the same time (example above). No back and forth. Just one clown who doesn't know how to send one message at a time.