Green’s Dictionary of Slang

crawfish n.

[crawfish v.]

1. [mid-19C+] (orig. US, also crawdad, crayfish) a coward, a groveller, one who backs down from a challenge, esp. a physical one; also as adj.

2. [mid-19C+] (orig. US) a political turncoat or rebel.

3. (Aus.) an apology.

4. [1960s] (US) a French person.

5. [1970s+] (US campus) a stingy, mean person.