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When you find someone with hair the colour of rust (redhead) extremely attractive.
That Ron Weasley is H-O-T, hot.

Mmm, rust lust.
by superkally June 01, 2011
The term for the love of ginger folk. There's just something a little bit special about a hair type that may soon be extinct!
person 1: ohhh Prince Harry!!!
person 2: YOU HAVE RUST LUST!!!
by rusterluster June 02, 2011