Slough MP Fiona MacTaggart posted the message at 20:25 GMT and gave people a retweet deadline of 21:00.
The Labour MP thanked the 14,268 retweeters for "being so generous for me" and posted that she had "no regrets" despite being "Twitter naive".
She called accusations she would claim the money back on expenses "sad".
Haha! Dozy woman got a bit more than she bargained for when she tried this publicity stunt! Fair play though if she follows through with it.