I would put the answer in a spoiler but. blimey, I’ve forgotten how.
Anyway, according http://en.wikipedia.org/wiki/Minced_oath…
A minced oath, also known as a pseudo-profanity, is an expression based on a profanity which has been altered to reduce or remove the disagreeable or objectionable characteristics of the original expression; for example, “gosh” used instead of “God,” “darn” instead of “damn” and “heck” instead of “hell”. Nearly all profanities have minced variants; the words that are most taboo give rise to the most.
In case you didn’t know, “blimey” is a minced oath for “God blind me.”