Chiefly Brittish: fellow.

To crack due to dehydration, as of skin or lips.

chapter

1. A crack in a lip caused usually by cold.
2. A boy or man; SYN. fellow, lad, gent, fella, blighter, cuss.
3. (Usually in the plural) Leather leggings without a seat; joined by a belt; often have flared outer flaps; worn over trousers by cowboys to protect their legs.

Stands for Challenge Handshake Authentication Protocol, a challenge response authentication scheme used in remote access.
See: Challenge Handshake Authentication Protocol (CHAP)