In Faster argot, a fortunate person. To quote from a typical faster tract:

If someone shouts: You rustshitter!, this is positive exclamation, akin to the pre-Technocalypse era "You lucky bastard!". Its originates from the wealthy trendy youths - fasters - who do not eat food but operate with a fusion plant within their improved bodies, which gives iron as the final product of nuclear fusion.
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Development Notes
Text by Jorge Ditchkenberg
modifications by Stephen Inniss
Initially published on 16 February 2004.