Green’s Dictionary of Slang

crip n.

[abbr. SE cripple]

1. [late 19C+] (also crippo) a disabled person.

2. [1920s+] (orig. US campus, also cript) anything easy; esp. in crip course, of a given college course [note crib n.3 (4)].

3. [1960s+] a wounded animal.

4. [1960s+] (UK juv.) a general insult; physical deformity is irrelevant.

In phrases

straight crip (n.)

[1910s–60s] (US tramp) a genuinely disabled person; thus phoney crip, one who poses as disabled for begging purposes.