Wiktionary
Wikipedia
The term 'crusties' can refer to two distinct, but not entirely separate, subcultural groups. Particularly in North America, but to some extent worldwide, the term is used to refer to crust punks. In the UK and Ireland especially, particularly in the 1990s, the term was used to refer to people who are members of a subculture related to the New Age travellers movement.
Usage examples of "crusties".
Is hard to get handle on their semiotics while they hide behind the lobster model we uploaded in their direction twenty years ago, but are certainly not crusties, and are definite not human either.
Having been thus aggravated by the indigenous population, the crusties rightly anticipated that the most damaging response would be to announce their intention to stay even longer.
And no, the signal didn’t contain any canned crusties: I think it’s an exchange embassy.