Now, leaving aside I don't know who or what dumpy is, being a bear of little brain, I have, by now, no clue what this was a reply to, having totally forgotten what I tweeted several hours earlier. As it happens it was:
Similarly I got:
Erm, yes? No? Perhaps? Here the original was:
In this case, even knowing what the reply was to it's not entirely clear what the question was and I had to ask for clarification. As it happens, I use the lovely Tweetdeck to read my tweets, so it's easy to pull up the conversation that the reply was part of (it's just a matter of clicking that View link) - but there is still that initial feeling of total confusion.
To try overcome this, when I reply to a tweet, I try to put some context in which will tie the reply or question back to the original tweet. For instance, never use 'it'. Don't say 'Is it really?', for instance, say 'Is your nose really bright red?'
Just imagine someone is reading your tweet from scratch. That way, no end of confusion can be prevented.